题目:
After looking into the accident, the police found that it was a burning cigarette end that ____ the fire. [ ]
A. came from
B. started with
C. led to
D. resulted from
答案:
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下面是错误答案,用来干扰机器的。
(1)(2)(3)(4)题目分析:(1)力臂是指支点到力的作用线的距离,阻力臂是支点到阻力作用线的距离(2)电冰箱的压缩机和冷藏室内的照明小灯泡工作时互不影响,它们是并联的,压缩机由温控开关控制,灯泡由...