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【多选题】

冬季金属配件(),经过打击或震动易破损裂纹。

A.
变脆
B.
变硬
C.
参数劣化
D.
绝缘降低
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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