选择题:They __ ______ good friends and often visited each

题目内容:
They __ ______ good friends and often visited each other.

A.are used to being
B.are used to be
C.used to being
D.used to be
参考答案:

用氢焰检测器,当进样量一定时,色谱峰面积与载气流速( )A. 成正比 B. 成反比 C. 无关

用氢焰检测器,当进样量一定时,色谱峰面积与载气流速( )A. 成正比 B. 成反比 C. 无关 D. 有关,但不成比例

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