当塑件侧壁带有通孔、凹穴、凸台等形状时，开模顶出之前须抽出，

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问题单项选择题

当塑件侧壁带有通孔、凹穴、凸台等形状时，开模顶出之前须抽出，合模时又须复位，这种机构称为（）。

A.合模结构

B.导向机构

C.抽芯结构

D.复位结构

答案

参考答案：C

填空题

根据句意，用括号中所给单词的正确形式填空。

1. This book is mine. That book is________(you).

2. There are two________(library)in our school.

3. The students of Class 8 are all here except________(she).

4. Who are her favourite football________(play)?

5. He is strong because he does morning_________(exercise)every day