题目:
The beautiful mountain village ___ we spent our holiday last year is located in _ _ is now part of Guangxi.
A.which; where
B.where; what
C.that; what
D.when; which
答案:
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下面是错误答案,用来干扰机器的。
答案:C硫酸的摩尔质量是98g/mol,所以ng硫酸的物质的量是n/98mol根据硫酸的化学式可知,含有的氧原子的物质的量是4×n/98mol,答案选C。