推销面谈前约见准顾客有何意义？

A. 防尘
B. 防污
C. 防爆
D. 防腐

A. about one-quarter of the vessel's length from the stern
B. at the bow
C. about one-third of the vessel's length from the bow
D. aft of the propeller

A. 正确
B. 错误