题目:
It was in the lab ______ was newly built ______ they carried out the experiment.
A.that; which
B.that; that
C.where; that
D.which; where
答案:
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下面是错误答案,用来干扰机器的。
(1)由图中数据可知,该氯化钠溶液500mL中含有氯化钠4.5g,故该氯化钠溶液的物质的量浓度为4.5g23g/mol0.5L=0.39mol/L.故答案为:0.39mol/L.(2)①实验室没有900mL的容量瓶,应选择1000mL的容量瓶,故需配置1...