题目:
By nine o'clock, all the Olympic torch bearers had reached the top of Mount Qomolangma, ____ appeared
a rare rainbow soon.
[ ]
A. of which
B. on which
C. from which
D. above which
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...