8.—You don’t look well, what’s wrong with you, Wang Ming? —Last night I watched the football match and didn’t go to bed ______ 12 o’clock. ( )(本题1.5分) A. when B. until C. as D. while
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长丝纤维的长度与直径的比一般大于( )。 A. 100:1 B. 1000:1 C. 10:1 D
长丝纤维的长度与直径的比一般大于( )。 A. 100:1 B. 1000:1 C. 10:1 D. 10000:1