单项选择题

阶跃信号的拉氏变换是1。

A.正确
B.错误

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多项选择题

按仓库建筑封闭程度划分，仓库可分为（）。
A、封闭式仓库
B、半封闭是仓库
C、露天式仓库
D、开放式仓库

Because Chenxiang is bitter in flavor and heavy in texture, it tends to go downward within human bodies,so it has the efficacy of sending down the stomach qi and arresting vomiting and can be used to treat various nausea and vomiting.

答案：正确