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【单选题】

It is usual to identify the fluids in pipes by bands of paint at intervals, and the engineer should familiarize himself with the code in use.According to the above sentence, which of the following statements is true?（）

A、People can know the types of fluids in pipes by feeling with hands

B、There are series of rings painted in the pipes to show various fluids

C、Engineers should wear cards standing for ranks

D、Engineer knows his own code very well

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更多“It is usual to identify the fluids in pipes by bands of paint at intervals, and the engineer should familiarize himself with the code in use.According to the above sentence, which of the following statements is true?（）”相关的问题

第1题

[单选题] It （） for an emergency generator to require paralleling.

A、is usual B、is not usual C、is necessary D、is not impossible

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第2题

[单选题] In which cases is reference partitioning effective in enhancing performance?（）

A、It is effective only in partition pruning. B、It is effective only in partitionwise joins provided that the query predicates are different from the partitioning key. C、It is effective in both partition pruning as well as partitionwise joins provided that the query predicates are identical to the partitioning key. D、It is effective in both partition pruning as well as partitionwise joins irrespective of whether the query predicates are different from or identical to the partitioning key.

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第3题

[] In consolidation service， it is usually the consignor who issues to each consignee his bill of lading.

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第4题

[] In consolidation service， it is usually the consignor who issues to each consignee his bill of lading.

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第5题

[判断题] In consolidation service， it is usually the consignor who issues to each consignee his bill of lading.

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第6题

[] It is（）practice to bring a present to the hostess when one is invited to dinner.

A、A.general B、B.usual C、C.ordinary D、D.common

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第7题

[单选题] When separating the lube oil without additive, it is usually cleaned with hot water; the aim is to remove （） from it.

A、acid B、sludge C、mechanical impurity D、salinity

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第8题

[单选题] Although the parties are entitled to make their contract in any manner that they like，it is usual for them to adopt one of the standard forms and then（）it as they think fit.

A、amend B、repair C、improve D、clear

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第9题

[判断题] It is important for the teacher to show students how easy it is to understand something from authentic materials rather than how difficult it is to understand everything.（）

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第10题

[] （）is the Shipowner’s duty to send the ship to the agreed，or in the absence of special agreement，to the usual place of loading．

A、A.That B、B.Which C、C.It D、D.Where

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