船舶前进中受正横前来风的影响，出现顺风偏的条件主要是：（）
A.船舶水线上的受风面积大
B.船舶的前进速度较低
C.风力较大
D.满载状态
参考答案：B
渗透泵型控释制剂的促渗聚合物
A．产生协同作用，增强药效B．减少或延缓耐药性的发生C．形成可溶性复合物，有利于吸收D．改变尿液PH，有利于药物代谢E．利用药物间的拮抗作用，克服某些药物的毒副作用
_____ your letter, I would have written back two days ago. [ ]
A. If I received
B. Should I received
C. Had I received
D. If I could have received
