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问题 多项选择题

注塑机液压用油的要求（）

A、适当的粘度

B、良好的润滑性

C、对机件及密封装置的腐蚀性要小

D、燃点（闪点）要求高

E、凝固点要低

答案

参考答案：A, B, C, D, E

补全对话，情景问答
给下列的问句选择合适的答语。
( ) 1. Who are they?
( ) 2. How many people are there in your family?
( ) 3. What's your father?
( ) 4. Is he a driver?
( ) 5. What's your mother?		A. Five.
B. She's a teacher.
C. Yes, he is.
D. My parents, my brother and my sister.
E. He is a doctor.
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单项选择题

(4 ). ( ) .

A．

B．

C．

D．

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