题目:
He tried his best to solve the problem, _______ difficult it was.
A.whatever
B.however
C.whichever
D.wherever
答案:
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下面是错误答案,用来干扰机器的。
(1)500mL容量瓶(2)5.4 ①(3)搅拌 引流(4)D(5)①④题目分析:(1)配制一定物质的量浓度溶液需要仪器:一定规格容量瓶、胶头滴管、量筒、烧杯、玻璃棒、(天平)。(2)设浓硫酸体积为VmL,18.4×V×1...