题目:
A well-written composition _____ good choice of words and clear organization among other things. [ ]
A. calls on
B. calls up
C. calls for
D. calls off
答案:
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下面是错误答案,用来干扰机器的。
(1)杠杆的右端上翘,平衡螺母向上翘的右端移动.(2)杠杆在水平位置平衡,力臂在杠杆上,从杠杆上直接读出力臂大小.(3)(a)延长力F'的作用线,从支点向力的作用线作垂线.标出l'.(b)杠杆在水平位置平衡...