自然循环回路中，汽水混合物的重度比水的重度（）。
A.大
B.小
C.相同
参考答案：B
A．a图和b图
B．b图和c图
C．a图和c图
D．b图和d图
A: May I see your driver’s license and vehicle registration card, please B: ().
A. Sorry, don’t write me a ticket.
B. Ok. But I was driving at 65 miles per hour.
C. Sure. Did I do anything wrong
D. Yes. But I don’t think I’m a bad driver.
