潮汐河口航道是指由()组成的受潮汐影响的航道。
A.河流近海段
B.河口河流段
C.河口潮流段
D.河口地区
E.口外海滨段
参考答案:B, C, E
— She sold her treasures to cure her mother’s illness, even though it was
her own wishes.
— It’s so kind _____ her.
A.against; of
B.above; of
C.on; for
D.for; for
与振动病发病率高低有密切关系的振动参数是
A.频率
B.加速度
C.接触振动的时间
D.工作体位和操作方式
E.工作环境的气温