下列中药为毒性中药的是（）。A、羊踯躅 B、炙狼毒 C、蟾蜍 D、炙川乌

— Does your sister remember to return the library book today?

— Oh, yes. Thank you. She's ______ it for two weeks. [ ]

A. kept

B. had

C. borrowed

D. keeping

John’s success has nothing to do with good luck. It is years of hard work _______has made him a great scientist today.

A．that

B．when

C．which

D．why

血容量增加15%～25%( )

A．产后半小时
B．产后2小时
C．产后4小时
D．产后3天内
E．产后7天内

二尖瓣狭窄所致的常见心律失常是

A．窦性心动过缓

B．窦性心动过速

C．房颤

D．室颤

E．阵发性心动过速

企业通过自身的利润留成和折旧进行的融资是( )。

A．外源融资

B．内源融资

C．直接融资

D．间接融资