What does your teacher often ask you to do?
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What did your classmates advise you when you said you got nervous easily while you were being tested?
What will the traffic policeman tell you to do if you jaywalk?
What do you want to know about space travel?
关于浮子式物位计下列说法正确的是
A. 恒浮力物位计
B. 变浮力物位计
C. 可用于测量料位
D. 液位越高，浮力越大
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