主动脉内球囊反搏是一种辅助循环装置以下正确的是（）。 A.用于主动脉瘤患者 B.用于

“Design of experiments” is a statistical method that helps ______ .

A) determine how various elements of a system interrelate
B) identify which factors may influence specific variables of a product or process
C) establish a standard by which to measure performance
D) compare actual or planned project practices to those of other projects

—May I take the magazine out of the reading room?  

—No, you can't. You _____ read it here. It's the rule.    [ ]

A. must

B. would

C. may

D. might

属于尿液溢出性蛋白的是

A．白蛋白
B．β-球蛋白
C．γ-球蛋白
D．凝血因子
E．肌红蛋白

当需要对方立即反馈时，（）是不属于快捷的方式。

A.电话

B.电子邮件

C.个人拜访

D.回信

故障的诊断通常按照（）先简后繁，先外后内，分短查找的方法。

A.先听先看

B.先易后难

C.先摸后试