同步电机额定转速（）理想空载转速。
A.大于
B.等于
C.小于
D.小于等于
参考答案：A
The schoolboys and schoolgirls are walking along the street, _____a small redcap .
A．each of them has
B．they each have
C．every wears
D．each wearing
全身性惊厥性癫痫持续状态时静脉注射西地泮的速度最大不超过每分钟（）
A.1mg
B.3mg
C.5mg
D.20mg
E.50mg
