搜题请搜索小程序“爱下问搜题”
问题 单项选择题

标注管螺纹的代号时，不能将管螺纹的代号标注在螺纹大径的尺寸线上，而是（）用引出线标注。

A、以说明的方式

B、以绘图的方式

C、以旁注的方式

D、以明细的方式

答案

参考答案：C

听力题

单词拼写（满分5分）

小题1:It’s hard to p     him into stopping smoking.

小题2:Scientists have so far failed to find a c    for cancer.

小题3:This film is m    to warn people against drugs.

小题4:Shall I p     you a cup of tea？

小题5:Her facial e     showed that she was angry.

小题6:When did Britain       (宣布) war against Germany in the Would War II.

小题7:Nobody trusted Peter, but he was really       (清白的)

小题8:     (咨询) your teacher when you meet with trouble.

小题9:She       (抱怨) to me about his rudeness.

小题10:If you are not satisfied with this book, I can       (推荐) you another one.
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单项选择题

关于酶的叙述，正确的是

A．酶耐底物都有绝对专一性

B．有些RNA具有酶的活性

C．酶的催化作用与空间构象无关

D．酶只能在中性环境发挥作用

E．所有酶均以酶原形式存在
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