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问题 单项选择题

配送网络计划的类型有战略计划，战术计划，应急计划和（）

A、操作计划

B、统筹计划

C、路线计划

D、仓储计划

答案

参考答案：A

选择题
— I felt it very difficult to carry on the work all by myself.
— I could have helped you, but you _____ me to.

A. hadn't asked
B. didn't ask
C. haven't asked
D. don't ask
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单项选择题

正常孕妇的血镁浓度为多少mmol/L( )

A．0.5～0.75
B．0.75～1.0
C．1.7～3.0
D．3～3.5
E．7.5～10
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