因眼部的生理发生老龄化改变时,不容易适应近用角膜接触镜的群体为()。
A、老视曾戴
B、老视初戴
C、屈光不正曾戴者
D、屈光不正初戴者
参考答案:B
The operator of the ship’s radiotelephone,if the radiotelephone is carried voluntarily,must hold at least a().
A.Mate's license
B.Restricted radiotelephone operator permit
C.Second-class radio operator's license
D.Seaman's document