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问题 单项选择题

门静脉高压症施行分流术后需卧床（）.

A.3天

B.5天

C.1周

D.10天

答案

参考答案：C

单项选择题

草坪建植前，对于PH>8.5的土壤进行改良不能使用()

A.硫酸亚铁

B.脱硫石膏

C.碱性栽培介质

D.酸性栽培介质
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单项选择题

Generally speaking, when the Herfindahl-Hirschman Index (HHI) is calculated by summing the squared percentage market shares, how many largest firms data is used in a industry, supposing there is a large number of firms in the industry:（）

A．4

B．10

C．50
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