胸腔闭式引流水封瓶长玻璃管没入水中长度为（）
A.1～2cm
B.2～3cm
C.3～4cm
D.4～6cm
E.6～8cm
参考答案：C
(2013·高考福建卷)Michelle found a job as a high school teacher which ________ spending quite a lot of time with students.
A．enjoys
B．involves
C．practices
D．suggests
下列哪些临床标本不能冷冻保存
A．脑脊液B．尿液C．伤口分泌物D．深部脓液E．胸水
