You'll find this medicine of great______

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问题选择题

You'll find this medicine of great__________ in helping you to get well.[ ]

A. effective

B. effect

C. valuable

D. useful

答案

答案：B

选择题

We are sure that scientists will _____ a way to solve the difficult problem . [ ]

A. put up

B. come up with

C. look up

D. come up

问答题

写出BCC晶体中的配位数(N)、致密度(K)、原子半径r与点阵常数a的关系式，在一个BCC晶胞中画出其室温时的一组滑移系并标出密排面与密排方向。