5LZ127型螺杆钻具的马达压降（）。A、0.25MPaB、2.5MPaC、25MP_爱下问搜题

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问题单项选择题

5LZ127型螺杆钻具的马达压降（）。

A、0.25MPa

B、2.5MPa

C、25MPa

D、2.5KPa

答案

参考答案：B

补全对话，情景问答

情景交际，根据所给句子，选择最佳的应答语。每个选项只能用一次。

( ) 1. When was the digital camera invented?
( ) 2. Why is that?
( ) 3. I bet cars weren't invented yet in 1876.
( ) 4. Life must have been hard when you were a child.
( ) 5. What are they used for?

A. Well, it gives us more time to study every day.
B. You can move the heels up and down.
C. It was invented in 1975.
D. Sure they were. They were invented in 1885.
E. Oh, not really. Why do you say that?
F. They are used for changing the style of the shoes.

单项选择题

治疗病毒性肺炎首选药物是（）

A.青霉素

B.氨苄青霉素

C.利巴韦林

D.庆大霉素

E.红霉素