题目内容

正火是用来处理低碳钢或中碳钢及渗碳钢，使其晶粒细化，增加强度和韧性，减少内应力，改善切削性能的。

A. 正确
B. 错误

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采暖施工图的识读是按照热介质流向―供热入口→供水总立管→供水干管→各立管→回水干管→热入口的顺序深入地进行识读。

A. 正确
B. 错误

表型的多基因性

Sometimes the charter-party states that the amount of cargo to be loaded is to be decided by the shipowners，e.g. 10000 tons of 2240 1b.，12％ more or less at（）option.

A. Charterer's
B. cargo owner'
C. owner's
D. shipper'

They were all very tired, but（）of them would stop to take a rest.

A. any
B. some
C. none
D. neither