子宫颈癌好发部位是
A.子宫颈管B.子宫颈内口C.子宫颈外口D.子宫颈前唇E.子宫颈后唇
参考答案:C
Last Saturday, we were walking along the street _____ a car suddenly knocked an old man over.
A when B while C as D since
所有的主飞行控制都由液压作动器PCA驱动,副翼系统有几个PCA?()
A、3个
B、6个
C、8个
D、12个