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【多选题】
监测爆破震动的注意事项有（）。
A.
应考虑爆破方法、药量、距离、地质状况等因素；
B.
监测爆破对地面的震动影响，宜在垂直方向及相正交的二个水平方向（其中一个方向为爆破点方向）上同时测定；
C.
监测爆破震动值的空间衰减情况时，至少应设3个测点。
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参考答案：
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【单选题】The Grand Canyon Standing on the rim of the Grand Canyon(大峡谷), gazing across this giant wound in the Earth’’s surface, a visitor might assume that the canyon had been caused by some ancient convulsion...
A.
it was caused by some ancient convulsion
B.
its presence is an embarrassment to the state of Colorado
C.
it looks like an injury on the Earth’s surface
D.
it has caused many visitors to injure themselves
相关题目：
【单选题】The Grand Canyon Standing on the rim of the Grand Canyon(大峡谷), gazing across this giant wound in the Earth’’s surface, a visitor might assume that the canyon had been caused by some ancient convulsion...
A.
it was caused by some ancient convulsion
B.
its presence is an embarrassment to the state of Colorado
C.
it looks like an injury on the Earth’s surface
D.
it has caused many visitors to injure themselves
参考解析：
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