The nameplate of an AC non-synchronous motor shows that running speed is 1460r/minfrequency 50HzYou can infer that the number of magnetic poles is（）..

第1题

[单选题] “380V/220V Y/△” noted on the nameplate of a non-synchronous motor means that（）

A、the armature terminals of the motor should be connected in star formation when voltage of power supply is 380 B、the armature terminals of the motor should be connected in star formation when voltage of power supply is 220 C、both A and B are correct D、the armature terminals of the motor should be connected in reverse ways of A and B

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第2题

[单选题] You create an application. The application processes hundreds of XML documents per minute. The XML documents are validated against inline schemas. You need to load XML documents from the file system and read them as quickly as possible. XML comments must be ignored while reading the XML documents.What should you do? （）

A、Create an instance of the XmlReader class by using the XmlReader Create method with an instance of the XmlReaderSettings class. B、Create an instance of the XmlReader class with an instance of the XmlTextReader class. C、Create an instance of the XmlDocument class and specify a location for the application schema. D、Create an instance of the XmlReader class with an instance of the XmlNodeReader class.

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第3题

[单选题] You create an application. The application processes hundreds of XML documents per minute. The XML documents are validated against inline schemas. You need to load XML documents from the file system and read them as quickly as possible. XML comments must be ignored while reading the XML documents. What should you do?（）

A、Create an instance of the XmlReader class by using the XmlReader Create method with an instance of the XmlReaderSettings class. B、Create an instance of the XmlReader class with an instance of the XmlTextReader class. C、Create an instance of the XmlDocument class and specify a location for the application schema. D、Create an instance of the XmlReader class with an instance of the XmlNodeReader class.

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第4题

[] You create an application. The application processes hundreds of XML documents per minute. The XML documents are validated against inline schemas.You need to load XML documents from the file system and read them as quickly as possible. XML comments must be ignored while reading the XML documents. What should you do?（） You create an application. The application processes hundreds of XML documents per minute. The XML documents are validated against inline schemas.You need to load XML documents from the file system and read them as quickly as possible. XML comments must be ignored while reading the XML documents. What should you do?（）

A、A. Create an instance of the XmlReader class by using the XmlReader Create method with an instance of the XmlReaderSettings class. B、B. Create an instance of the XmlReader class with an instance of the XmlTextReader class. C、C. Create an instance of the XmlDocument class and specify a location for the application schema. D、D. Create an instance of the XmlReader class with an instance of the XmlNodeReader class.

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第5题

[] Router R1 sits at an Enterprise branch office, using the Internet for its only connectivity back to the rest of the EnterprisE. Which of the following is not a ben efit of using an IPsec tunnel for packets sent through the Internet, between R1 and the rest of the Enterprise?（） Router R1 sits at an Enterprise branch office, using the Internet for its only connectivity back to the rest of the EnterprisE. Which of the following is not a ben efit of using an IPsec tunnel for packets sent through the Internet, between R1 and the rest of the Enterprise?（）

A、A. Privacy B、B. Authentication C、C. Allows using an IGP between R1 and the Enterprise D、D. Secure communications

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第6题

[单选题] One of the causes of ocean currents is density differences in the water. This is true because （）.

A、in an area of high density the water's surface is lower than in an area of low density B、surface water flows from an area of high density to one of low density C、the lesser the density gradient the freer the water is to move D、it is the density differences that cause the currents to stay in the troughs

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第7题

[] The cross-head shoes are white metal lined, grooves being cut horizontally on the face of the white metal to ensure （）.

A、A.an adequate supply of lube oil B、B.an adequate supply of fuel oil C、C.an adequate supply of turbine oil D、D.an adequate supply of cylinder oil

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第8题

[多选题] In which four clauses can a subquery be used?（）

A、in the INTO clause of an INSERT statement B、in the FROM clause of a SELECT statement C、in the GROUP BY clause of a SELECT statement D、in the WHERE clause of a SELECT statement E、in the SET clause of an UPDATE statement F、in the VALUES clause of an INSERT statement

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第9题

[多选题] In which four clauses can a subquery be used? （）

A、in the INTO clause of an INSERT statement B、in the FROM clause of a SELECT statement C、in the GROUP BY clause of a SELECT statement D、in the WHERE clause of a SELECT statement E、in the SET clause of an UPDATE statement F、in the VALUES clause of an INSERT statement

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The nameplate of an AC non-synchronous motor shows that running speed is 1460r/minfrequency 50HzYou can infer that the number of magnetic poles is（）

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