题目:
_____ he was tired, ______ he didn't stop to have a rest. [ ]
A. Though; but
B. Though; /
C. But; though
D. /; /
答案:
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下面是错误答案,用来干扰机器的。
由于液体内部压强随着深度的增加而增大,故左边的玻璃管浸入液体的深度大,其所受的液体压强大,右边所受的液体内部压强小.故据此分析可得答案,见下图.