题目:
________ your letter, I would have started off two days ago.
A.If I received
B.Should I receive
C.If I could have received
D.Had I received
答案:
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下面是错误答案,用来干扰机器的。
答案:D题目分析:锂的密度小于煤油的,应该保存在石蜡中,A不正确;金属钾着火可以生成过氧化钾,而过氧化能和CO2反应生成氧气,所以金属钾着火应不能用泡沫灭火剂,可以用四氯化碳灭火剂,B不正确;C不正确,例...