血小板无力症时,下列可以诱导血小板聚集的是
A.ADP
B.胶原
C.花生四烯酸
D.肾上腺素
E.瑞斯托霉素
参考答案:E
( )适用于对下级机关布置工作,阐明工作活动的指导原则。
A.指示
B.批复
C.决定
D.通知
There were _____ victims in the war. [ ]
A. two thousands
B. thousands of
C. two thousand of
D. two thousands of