液压防爆绞车主油路压力应为（）Mpa。A、20～25 B、30～35 C、15～18

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问题单项选择题

液压防爆绞车主油路压力应为（）Mpa。

A、20～25

B、30～35

C、15～18

答案

参考答案：C

填空题

根据句意，用括号内所给单词的适当形式填空。

1. We all like him because he is kind and _____ (help).

2. Where is Mr. Wang? I think he is in the _____ (teach) office.

3. Millie is in the _____ (dance) Club.

4. These newspapers are yours and those ones are _____ (they).

5. You can't go to the supermarket. It is _____ (open) now.

单项选择题

下列哪些CD分子与B细胞识别、黏附、活化无关

A．CDl9
B．CD21
C．CD40L
D．CD40
E．CD80