离心式水泵启动前,入口门应()、出口门关闭,轴承室内油位在()间。
参考答案:开启、1/2~2/3
阅读下面对话,从方框内7个选项中选择5个恰当的句子完成此对话,并将其番号填入题前括号内。
A.Can you help me?
B.What color would you like?
C.Can I help you?
D.Do you have a smaller one.E. How much are they?
F. What about this one?
G. What’s the price?
A: 1
B: Yes, please. I want a skirt for my daughter.
A: 2
B: Green or blue.
A: Look at the skirts over there. We have different colors.
Which would you like?
B: I think the green one is nice. 3
A: It’s 150 yuan.
B: Oh, it’s too expensive(贵)
A: 4 It’s only 60 yuan.
B: It’s cheap, but it is big. 5 .
A: Yes. Here you are.
对汽车空调的冷冻润滑机油的要求是()。
A、凝固点的温度应低
B、凝固点的温度应高
C、高温的流动性应良好
D、低温的流动性可不作要求