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【判断题】
爆炸是指物质瞬间突然发生物理或化学变化，同时释放出大量的气体和能量(光能、热能、机械能)并伴有巨大声响的现象。()A.
正确
B.
错误
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举一反三
【单选题】My wallet is nowhere to be found. I______ when I was on the bus.
A.
must drop it
B.
should have dropped it
C.
must have dropped it
D.
had dropped it
【单选题】My wallet is nowhere to be found. I______it when I was on the bus.
A.
must drop
B.
had dropped
C.
must have dropped
D.
should have dropped
【简答题】机器和机构有何区别?
【简答题】从原理课研究的角度来说,机器和机构有区别吗?
【简答题】机器和机构有何区别?
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