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【判断题】

当被保护对象受到爆破震动作用而不产生任何破坏的峰值震动速度称为安全震动速度。

A.
正确
B.
错误
举报
参考答案:
参考解析:
.
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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