题目内容

Listen to the following sentence with compound nouns and make the correct choice from the selections.

A. It must be lunchtime by now.
B. It must be lunchtime by now.

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What are the functions of sentence stress?The stress of English sentences is the basis of the rhythm of discourse, and the rhythm of the sentence is mainly reflected by the alternation of light and stress.

A. 对
B. 错

注射成型时，锁模力的校核与很多因素有关，下面哪一因素是正确的（）

A. 塑料熔体对型腔的成型压力
B. 保压时间
C. 注射机的注射量
D. 注射温度

模具定位圈的外径尺寸必须与注射机的定位孔尺寸相匹配。通常采用配合，以保证模具主流道的中心线与注射机喷嘴的中心线重合。（填间隙或过盈或过渡）

注射模具在注射机上的安装方法有两种，一种是用螺钉直接固定；另一种是用螺钉和_______ 固定。