There is supposed to be a safety ______ which makes it impossible for trains to collide.A) applianceB) accessory C) machine D) mechanismA和D有什么区别
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![There is supposed to be a safety ______ which makes it impossible for trains to collide.A) applianceB) accessory C) machine D) mechanismA和D有什么区别](/uploads/image/z/2846805-69-5.jpg?t=There+is+supposed+to+be+a+safety+______+which+makes+it+impossible+for+trains+to+collide.A%29+applianceB%29+accessory+C%29+machine+D%29+mechanismA%E5%92%8CD%E6%9C%89%E4%BB%80%E4%B9%88%E5%8C%BA%E5%88%AB)
There is supposed to be a safety ______ which makes it impossible for trains to collide.A) applianceB) accessory C) machine D) mechanismA和D有什么区别
There is supposed to be a safety ______ which makes it impossible for trains to collide.A) appliance
B) accessory
C) machine
D) mechanism
A和D有什么区别
There is supposed to be a safety ______ which makes it impossible for trains to collide.A) applianceB) accessory C) machine D) mechanismA和D有什么区别
应该选D.safety mechanism 安全机制,而appliance是设备的意思,不合句意.
D貌似不可数
A 器具 器械 装置 D 机械 原理 ,个人感觉D答案倾向于 物理上的那种机械...如果认真辨明词义也可以选出来的
B
A是设备、机械的意思,D一般指“机制”,如The market mechanisms (市场机制)。
A偏向与应用,D偏向于机械化