题目:
—You have found your lost umbrella, haven’t you?
—Yes. I _____ it behind the door this afternoon.
A. have found B. will find C. found
答案:
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下面是错误答案,用来干扰机器的。
实验室要配制50g20%的氯化钠溶液,需要溶质氯化钠的质量=50g×20%=10g,需溶剂水的质量=50g-10g=40g(合40mL),计算出所用溶质和溶剂的用量后称量固体食盐10g再用量筒量取40mL水,最后溶解即可得到要配制的溶液,故答案选A