Which of the following laboratory tests should be monitored closely by the nurse while the client is receiving heparin therapy

A. International normalized ratio (INR).
B. Activated partial thromboplastin time (APTT).
C. Prothrombin time (PT).
D. Thrombin tim

高层建筑采暖管道支、吊、托架安装应符合设计要求，如滑动支架应灵活，滑托与滑槽两侧间应留有（）mm的间隙。

A．2～5

B．3～5

C．2～6

D．3～6