单项选择题

面心立方晶体结构的致密度是

A．1.0
B．0.74
C．0.68
D．0.5

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单项选择题

In the following reactions, the one of which the final products don’tinclude sulfide precipitates is ( )

A．Reaction of acidic Na3AsO3 solution with H2S solution
B．Reaction of SbCl3 solution with excess Na2S solution, then with dilute hydrochloric acid
C．Reaction of Bi(NO3) 3 solution with excess Na2S solution
D．Reaction of Na3AsO3 solution with excess Na2S solution

不定项选择

物业公司公开作出的有利于业主服务承诺及制定的服务细则，不是物业服务合同的组成部分。 ‌

A．正确
B．错误