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问题 单项选择题

设广义表L＝(soldier，(teacher，student)，(worker，farmer))，head和tail函数把原子student从广义表L中分离出来的运算是 (17) 。

A．tail(head(tail(head(L))))

B．head(tail(head(Tail(L))))

C．tail(head(tail(head(L))))

D．head(tail(tail(head(L))))

答案

参考答案：B

多项选择题

中成药贮存中常见的变异现象有

A．酸败

B．挥发

C．沉淀

D．霉变

E．虫驻
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单项选择题

How should you signal the crane operator to use the main hoist?（）.

A.Use one hand to give any miotion signal , and place the other hand motionless in front of the hand giving the motion signal

B.Extend arm with the thumb pointing up , and flex the fingers in and out for as long as the load movement is desired

C.First tap your elbow with one hand , and then proceed to use regular signals

D.First tap the top of your head with your first , and then proceed to use regular signals
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