为了降低本底，γ谱仪在测量时应放置在一定厚度的哪类屏蔽室内（）。
A.铝
B.铅
C.木头
D.塑料
E.橡胶
参考答案：B
汉译英，并用适当的形式填空。
1. Would you like to come and ___ us ___ (加油)?
2. That's very kind of you, but I can ___ it ___(自已解决).
3. Two pills ___ ___ (每次) three times a day.
4. Robots can ___ ___ ___ (代替) of humans to do hard or boring work.
5. Tenger ___ ___ ___ (以…著名) his folk songs.
6. They are very ___ ___ (流行) young people.
经营计划编制的重点依据是( )。
A．财务状况B．市场需要C．人事计划D．战略计划
