革兰染色阴性的厌氧菌是（）
A.难辨梭状芽胞杆菌
B.铜绿假单胞菌
C.军团菌
D.肺炎链球菌
E.结核分枝杆菌
参考答案：A
It has calculated that the earth's circumference around the equator is over forty miles longer than that around the poles.
根据有关规定，一般用电设备的电压偏移量为( )。
A．±1%B．±3%C．±4% D．±5%
