在其它条件不变时,水流对船舶舵效的影响是()
A.逆流或顺流航行时,舵效相同
B.逆流航行舵效优于顺流航行
C.顺流航行舵效优于逆流航行
D.无法比较
参考答案:B
--- I think Tom is kind of unhealthy.
--- I agree with you. He ___ take exercises.
A.ever
B.usually
C.sometimes
D.hardly ever
黄河中、下游分界的城市是()
A.河口
B.宜昌
C.孟津
D.湖口