依法必须进行招标的项目，自招标文件开始发出之日起至投标人提交投标文件截止之日起，最短不少于( )日。

A．5
B．10
C．15
D．20

Which nursing measure would be most effective in helping the client cough and deep breathe after a cholecystectomy

A. Having the client take rapid, shallow breaths to decrease pain.
B. Having the client lay on the left side while coughing and deep breathing.
C. Teaching the client to use a folded blanket or pillow to splint the incision.
D. Withholding pain medication so the client can be alert enough to follow the nurse’s instructions.