题目内容

喷气引纬的主喷嘴由、和组成，

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关于主喷嘴的安装有两种，第一种是主喷嘴固定安装在机架上，不随筘座一起前后摆动，可称为。主喷嘴固装在筘座上，随筘座一起前后摆动，它可以保证喷嘴与筘槽或管道片始终对准，可称为。通常，我们常常采用的是。

--I put my purse on the table just now, have you seen it?No. I haven’t. You should never put __________ on the desk anyway.

A. anything important
B. important anything
C. something important
D. important something

--How was your final exam?The English and Maths papers weren’t __________ for me. I hope I haven’t failed.

A. easy enough
B. difficult enough
C. enough easy
D. enough difficult

As long as you drive __________, you will be very safe.

A. careful
B. careless
C. carefully
D. more carefully