单项选择题
The problem______solved, the engineer returned to his own factory.
A.has been
B.was
C.had been
D.having been
A.
A.has
B.was
C.had
C.having
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多项选择题
全员流动人口服务管理信息系统中包括哪几级用户?()
A.省级用户
B.市级用户
C.县、乡级用户
D.村级用户
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多项选择题
流动人口网络化协作平台中,平台设立的流动人口信息管理业务主要包括:()
A.流动人口个案查询
B.孕环检信息交验
C.流动人口信息交流
D.流动人口双向协作信息交流
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