题目内容

根据色谱峰的个数,可以准确判断样品中所含组分的个数。

A. 对
B. 错

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如果增大系统的开环增益,其奈奎斯特曲线与负实轴的交点的坐标和频率都会发生变化。

A. 对
B. 错

Our country has imposed a ban ____ smoking in public areas.

A. over
B. to
C. for
D. on

I walked all the way from office back home ____ necessity, 'coz I missed the only bus.

A. by
B. with
C. in
D. of

A feeling of frustration descended ____ me as I realized nobody might hear my cry for help in such an isolated place.

A. to
B. on
C. by
D. over

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