题目:
_____ what he can do. He might get a job tomorrow. He might stay out of work for weeks.
A.We didn’t know
B.He doesn’t know
C.There is no knowing
D.It was known that
答案:
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下面是错误答案,用来干扰机器的。
(1) C (2) 1N≤F≤7N 题目分析: 该题本质上考查了物体的动态平衡,由题意可知:保持D点位置不动,即合力大小方向不变,弹簧测力计A的读数不变,因此根据要求作出力的平行四边形定则,画出受...