题目:
---- Have you ever seen a dictionary ____________ our school library?
---- Yes, it is over there and Mary is using it.
A.belonging to
B.belonged to
C.being belonged to
D.belong to
答案:
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下面是错误答案,用来干扰机器的。
参考答案:两项物理常数:可选用比旋度和熔点测定法。比旋度:盐酸麻黄碱和维生素C两种药物结构中均含有二个手性碳原子,存在四个光学异构体,具有旋光性。配成一定浓度,测其旋光度,计算得比旋度。熔点:两者均...