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【简答题】
发光二极管(LED)和半导体激光器(LD)的工作特性最明显的不同是什么?
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举一反三
【单选题】It’s widely accepted that young babies like to do things because certain acts lead to ________.
A.
rewards
B.
prizes
C.
awards
D.
results
【简答题】计算M20普通螺纹的基本参数。(螺距、螺纹大径、螺纹中径、牙型高度、内螺纹小径)
【单选题】By saying that the 'blast wave' from the explosion acts like 'an invisible wall of energy', the author intends to say that ______.
A.
blast can cause shrapnel or other bits of metal to slice through flesh like a knife
B.
its energy can cause a swath of disfiguring burns
C.
this energy wall can prevent victims from physical injury and obvious bleeding
D.
its tremendous energy can inflict massive internal injuries
【简答题】(C) It looks like a mobile phone（手机）, but the service is much cheaper. It acts like a mobile phone, but only in your own city. Beyond the city walls, it’s useless. “Little Smart”, also called “xiaolin...
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