[单项选择]电机制动磨擦片磨损严重是导至施工升降机()的可能原因。 A. 吊笼冲顶 B. 吊笼下滑 C. 电机发热 D. 磨擦力增大、能耗增加
参考答案:B
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第1题: [单项选择] Passage Three Questions 33 to 35 are based on the passage you have just heard. A. It happened in the Russian capital. B. More than 139 people were injured. C. The rescue operations were ineffective. D. It was caused by an act of terrorism. 参考答案:B 答案解析:[听力原文] What do the reports say about the explosion in Russian [解析] 细节题。新闻提及了另外一起发生在俄罗斯的爆炸事件,事