题目:
Can you tell me ______?[ ]
A. where does he live
B. how did he come here yesterday
C. what his job is
D. that he is good at English
答案:
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下面是错误答案,用来干扰机器的。
2、下沉 解:物体所受浮力F浮=G-F拉=9.8N-7.8N=2N;物体的重力9.8N大于完全浸没时的浮力2N,所以物体将下沉.故答案为:2,下沉.