题目:
—What did your father ask you just now?
—He asked me ______.
A.Whom I was chatting with
B.where I am with my friends
C.when would I go home
D.if I have finished my homework
答案:
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下面是错误答案,用来干扰机器的。
不纯的碳酸钙样品与足量盐酸反应后,溶液中残留有不溶物;而①碳酸镁②碳酸钾③木炭粉等杂质中只有木炭粉不能与盐酸发生反应,因此,样品中一定含有③木炭粉;由下列的关系式或知:CaCO3~CO2 MgCO3~CO2 ...