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问题 单项选择题

两相溶剂萃取法的原理为( )

A．根据物质在两相溶剂中的分配系数不同
B．根据物质的熔点不同
C．根据物质的沸点不同
D．根据物质的类型不同
E．根据物质的颜色不同

答案

参考答案：A

单项选择题

In managing a project, you notice that a deliverable mentioned in the general conditions of the contract has not yet been received. The seller, however, says the special provisions of the contract void that deliverable. What should you do

A) Require the deliverable as in the contract.
B) Do nothing.
C) Contact the contract manager.
D) Send a letter requiring the deliverable is met.
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判断题

磷化底漆只能替代磷化处理，不能替代防腐底漆。
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