∫e1(1x+2x)dx等于（ ） A．e2 B．e2-1 C．e+1 D．e-1

粉末中纤维单个散在，呈长梭形的药材为

A．黄芪

B．牛膝

C．苦参

D．厚朴

E．肉桂

反映内源性凝血机制有无异常常用筛选试验 （）

A.PT

B.CT

C.APTT

D.CRT

E.PLT

A．Because she hadn’t heard of the writer at the time.

B．Because it wasn’t on any of the professors’ reading lists.

C．Because it was published after she had finished her research.

D．Because it was only available in French.

12、13世纪流行一种被称为（）的体裁形式，它既可以是单声歌曲也可以是复调形式。

在______条件下，互补的单股核酸链缔合成双股分子。