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【单选题】

An amplitude of the Sun in high latitudes().

A、is most accurate before sunrise

B、is most accurate after sunset

C、should only be observed when the Sun's lower limb is above the horizon

D、is most accurate when the Sun's center is observed on the visible horizon

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第1题

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2题

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

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

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6题

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7题

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8题

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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