防止气门弹簧发生共振的措施有：（） A.提高气门弹簧的自然振动

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问题多项选择题

防止气门弹簧发生共振的措施有：（）

A.提高气门弹簧的自然振动频率

B.降低气门弹簧的自然振动频率

C.采用双气门弹簧，且旋向相同

D.采用双气门弹簧，且旋向相反

答案

参考答案：A, D

填空题

根据句意及首字母提示,补全单词。

1. My mother likes to listen to light m_______.

2. She doesn't like the colour gray. Me, e__________.

3. Wu Fei is thin and tall. He looks l_________his father.

4. When they visited Jinan, they took many p__________.

5. —Who are you going to i__________ to me?

—Jack. I think you'll be good friends.

填空题

分别写出《红楼梦》判词关涉的三个人物的姓名（）、（）、（）。