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问题
多项选择题
卡钻的类型包括（）。
A.沉砂卡钻
B.井塌卡钻
C.压差卡钻
D.键槽卡钻
E.缩径卡钻
答案
参考答案：
A, B, C, D, E
补全对话，情景问答
给问句选出相应的答语。
( ) 1. What are you doing?
( ) 2. What's the matter?
( ) 3. What's the forecast?
( ) 4. Does he need an English book?
( ) 5. Can I help you?
A. I can't find my teddy bear!
B. Yes, please.
C. I am packing my suitcase.
D. It's rainy and cool.
E. No, he doesn't.
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填空题
M24表示：公称直径为（）的粗牙普通螺纹。
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