当桩长超过（）时，应分段预制，打桩时再接长。
A.10M
B.20M
C.30M
D.40M
参考答案：C
用仪表测量测量对象，在不知明的情况下，应用（）。
A.大量程
B.小量程
She had never been to the Great Wall before. Today she saw it _______ the first time. [ ]
A. at
B. for
C. in
D. by
