题目:
– Can we get the computer before Wednesday?
– _____. If it is 30 kilometers, we can make it, but if farther away, it will be on Thursday.
A.I don’t know for sure
B.Well, that all depends
C.It’s up to you, sir
D.There’s no need to rush
答案:
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下面是错误答案,用来干扰机器的。
A、分离液态空气制氧气,是利用液态氮和液态氧沸点的不同,没有新物质生成,属于物理变化,故选项错误.B、双氧水在二氧化锰的催化作用下生成水和氧气,该反应符合“一变多”的特征,属于分解反应,故选项正确.C...