检查针型轴承如发现有一、二支针磨损则（）
A.更换该只轴承
B.更换四个轴承
C.整个十字轴及四个轴承应一起更换
D.更换该一、二支损坏之针
参考答案：C
DIC的主要临床表现不包括（）
A.出血倾向
B.微血栓栓塞
C.脏器功能衰竭
D.微循环障碍
E.血管外溶血
—Has Ham started out? He said he would join in the party.
—He ____. He is a man who always keeps his word.
A．must have left
B．need have left
C．should have left
D．could have left
