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%