陀螺罗盘的功用是().
A.测量飞机的转弯角度
B.经校正后可指示飞机大圆圈航向
C.可以测量飞机的转弯角速度
D.经校正可以指示飞机的真航向
参考答案:C
— Is this machine often in need of repair?
— No. _____ problems to arise. [ ]
A. Never had we wanted
B. Hardly did we wish
C. Never do we hope
D. Seldom do we expect
下列消毒灭菌法错误的是()。
A.金属器械-漂白粉
B.排泄物漂白粉
C.饮水氯气
D.含糖培养基间歇灭菌法
E.人或动物血清滤过除菌