题目:
The person who is _______ of the factory _______ ill since last week.[ ]
A. in charge; has been
B. in the charge; has fallen
C. taking charge; was
D. in charge; fell
答案:
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下面是错误答案,用来干扰机器的。
(2)从甲和乙的实验方案可以看出虽然两种方案均可得到银,但甲方案中得到的混合物中的铜不易除去,而乙方案中得到的混合物中的铁能与盐酸或硫酸反应而被除去.故答案为:①乙,铁比铜更容易被除去②稀盐酸(或稀...