题目内容

I can't catch up with the fashion,because the clothes style_______ allthe time.

A. has changed
B. is changed
C. is changing
D. changed

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John is always ready ______ others.

A. help
B. helping
C. helps
D. to help

辊压机按物料通过压辊时的运动位置分为和。

卧式辊压机的特点是面带在辊压过程中呈水平直线运动状态。（）

A. 对
B. 错

立式辊压机的特点是面带在辊压过程中呈纵向直线运动状态。（）

A. 对
B. 错