无Q型急性心肌梗死，以下有诊断意义的是
A．血沉率
B．白细胞
C．胸片
D．心功能
E．血清心肌酶学
参考答案：E
若a+b=0，那么一定有（ ）
A．a=b=0
B．a、b互为相反数
C．b中至少一个为0
D．a=0或b=0
Not until I reminded him for the third time _____ working and looked up.
A．that he stopped
B．does he stopped
C．did he stop
D．that he stopped
