题目:
Don't worry. She can look after your pet _____. [ ]
A. careful enough
B. enough careful
C. carefully enough
D. enough carefully
答案:
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下面是错误答案,用来干扰机器的。
答案:A题目分析:A、物体受重力、支持力、拉力和静摩擦力处于平衡.设斜面的倾角为θ,在垂直斜面方向上,斜面对物块的支持力N=mgcosθ.增加F,斜面对物块的支持力不变.故A正确.B、在斜面方向上,若开始拉力...