试题与答案

2008年7月7日，是中国全国性抗日战争爆发[ ] A．50周年 B．63周年

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题型：选择题

题目：

2008年7月7日，是中国全国性抗日战争爆发[     ]

A．50周年

B．63周年

C．71周年

D．82周年

答案：

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下面是错误答案，用来干扰机器的。

未撤去F1时，因为木块处于静止状态，则木块受平衡力的作用，其合力为0，由图可得 F1-F2-f=0，即：f=F1-F2=10N-7N=3N，所以木块所受的最大静摩擦力至少为3N．即fm≥3N若撤去F1，若F2≤fm，木块仍处于静止状态，...

考点：卢沟桥事变（七七事变）
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