皮皮学，免费搜题
登录
搜题
【单选题】
电气设备发生火灾时,为了防止触电事故,一般都在切断电源后扑救,下面操作正确的是( )。A.
电气设备发生火灾后，要立即切断电源
B.
发生火灾后，用闸刀开关切断电源时，由于闸刀开关在发生火灾时受潮或烟熏，其绝对强度会降低，切断电源时最好用绝缘的工具操作
C.
切断用磁力启动器控制的电动机时，用按钮开关停电，然后用断开闸刀开关，防止带负荷操作产生电弧伤人
D.
切断电源时用电动机的控制开关切断电动机回路负荷电流，停止各个电动机的运转，然后再用总开关切断配电盘的总电源。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】测试导入单选题5 When you are reading an article, your purpose is to find the general idea of the article. Then which reading strategy will you employ?
A.
选择1 scanning
B.
选择2 skimming
C.
选择3 identifying attitudes and making inferences
D.
选择4 identifying and understanding argument
【单选题】When you are reading an article, your purpose is to find the general idea of the article. Then which reading strategy will you employ?
A.
scanning
B.
skimming
C.
identifying attitudes and making inferences
D.
identifying and understanding argument
【简答题】adj. noticable, clearly different
【单选题】Paraphrase the underlined word in the following sentence. Some students might try to make those facts an argument for learning a lot things in a very short time----holding off until the last day befor...
A.
cramming
B.
researching
C.
studying
D.
swallowing
【简答题】Answer the questions with the words or expressions given below. comfortable interact opportunity advantage knowledge single- peer distract concentrate decrease co-educational get i...
【简答题】Some people claim that, in the age of television, reading books is not as important as it once was and that people can learn as much by watching television as they can by reading books. Do you agree o...
【简答题】Consider the overall structure of this reading. Is it a description, a comparison or an argument?
相关题目：