题目内容
对背信用证适用于下列哪种贸易方式（ ）
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一张每期用完一定金额后，需等开征行通知到达，才能恢复到原定金额继续使用的信用证是（ ）
If an obstacle needs to be cleared, the pilot climbs at the speed for____climb angle (Vx), which results in the greatest altitude gain per unit of horizontal distance traveled.
If no obstacle needs to be cleared, or after an obstacle is cleared, the pilot can accelerate to the ____ rate of climb speed (Vy), where the aircraft will gain the most altitude in the least amount of time.
Generally speaking, Vx is a lower speed than Vy, and requires a higher____attitude to achieve.
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