为预防血管内导管所致血流感染，应每日常规更换输液管。
参考答案：错
解析：不应每日常规更换输液管
You've failed to do what you ____ to and I'm afraid the teacher will blame you. [ ]
A. will expect
B. will be expected
C. expected
D. were expected
混合料中个组分之间比重相差太大时，对混匀制粒（）。
A.有利
B.不利
C.不影响
