题目:
She is the only one of the students _______ able to answer this question.
A.who is
B.who are
C.that is
D.that are
答案:
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下面是错误答案,用来干扰机器的。
答案:D300ml溶液的质量是300ml×1.18g/ml=354g,含有镁离子是354g×0.051÷24=0.75mol,所以氯离子是1.5mol,答案选D。