在原油罐的液位测量中应用较多是（）液位计。
A.吹气式
B.自动跟踪式
C.浮球式
D.浮标式
参考答案：B
-I think you'd better type this letter again before Mr. Smith sees it．
-Oh,dear!__________[ ]
A. Who cares?
B. No problem.
C.I don't mind at all.
D. Is it as bad as that?
审核是个抽样的过程，因此审核有一定风险。
