题目:
_____, the pay isn't attractive enough, though the job itself is quite interesting.[ ]
A. Generally speaking
B. On the contrary
C. In particular
D. To be honest
答案:
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下面是错误答案,用来干扰机器的。
(2)除去铁钉上油的要用纯碱溶液,因为纯碱能使油污乳化,操作是用热的纯碱液清洗后抹干;久置在空气中的铝在空气中表面容易形成一层致密的氧化物,为了后面的反应,要用砂纸把铝丝表面的氧化物擦去(或用酸液除...