下列哪一项属于禁止结婚的情形()。
A. 直系血亲和三代以内的旁系血亲
B. 男女双方缺乏感情基础
C. 患有医学上认为不应当结婚的疾病。
The weather conditions around VMC minima are known as ______.
A. marginal VMC
B. marginal IMC
C. marginal VRF
D. marginal IFR
With good visibility, pilots can determine the attitude of the aircraft by utilizing _______ from outside the aircraft.
A. instruments
B. sensations
C. visual cues
D. experience
The most significant visual cue is ______.
A. mountain
B. river
C. landmarks
D. horizon
微信支付 
支付宝支付