问题
单项选择题
故障树分析是用一系列事件符号、( )和转移符号描述系统中各种事件之间的因果关系。
A．集合符号
B．运算符号
C．几何图形
D．逻辑符号
答案
参考答案：D
解析： 故障树表示产品的那些组成部分的故障模式或外界事件或它们的组合导致产品的一种给定故障模式的逻辑图。它用一系列事件符号、逻辑符号和转移符号描述系统中各种事件之间的因果关系。
搜题请搜索小程序“爱下问搜题”
故障树分析是用一系列事件符号、( )和转移符号描述系统中各种事件之间的因果关系。
A．集合符号
B．运算符号
C．几何图形
D．逻辑符号
参考答案：D
解析： 故障树表示产品的那些组成部分的故障模式或外界事件或它们的组合导致产品的一种给定故障模式的逻辑图。它用一系列事件符号、逻辑符号和转移符号描述系统中各种事件之间的因果关系。
阅读下面的短文，掌握其大意，然后从41-60各题所给的四个选项（A、B、C和D）中，选出最佳选项。） I was on a bus one March evening. The driver didn’t 41 to start the bus soon because it was not yet 42 . A middle-aged woman got on. Tired and sad, she told her story 43 not to anyone in particular. On her way to the station, half of her 44 was stolen. The other half was hidden under her blouse, so she 45 still had some left. A few minutes later, she stopped crying, but still looked 46 . When all the seats were taken, the driver started the engine. The conductor began to collect fares(车费). When she came to an old man in worn-out（破旧的）clothes, he 47 that he had spent all his money when he had accidentally got on a wrong bus and now he was trying to go home. On hearing this, she ordered the old man to 48 the bus. The old man was almost in tears as he 49 her to let him take the bus home. The driver took the conductor’s side(站在某人一边) and repeated the conductor’s 50 . The woman was watching the incident. 51 the driver and the conductor raised their voices at the old man, she interfered(干预). “Stop 52 him! Can’t you see he’s only trying to get home?” “He doesn’t have any money! ” the driver 53 . “Well, that’s no 54 to throw him off the bus,” she insisted. Then she reached inside her blouse, look out her 55 money, and handed it to the conductor. “Here’s his fare and mine. Just stop giving him a 56 time.” All heads turned to the woman. “It’s only money,” she shrugged（耸肩）. She rode the rest of the way home 57 a happy smile, with the money she’d lost earlier 58 . On the road of life, the help of strangers can 59 our loads（负担）and lift our spirits. How much sweeter the 60 will be when we make it a little smoother for others!
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