用含有大量（）的污水灌溉农田，会堵塞土壤孔隙，影响通风，不利于禾苗生长。
A.酸性
B.碱性
C.SS
D.有机物
参考答案：C
领导就是引导和影响人们实现组织或群体的目标而作出努力与贡献的人。
A vessel loads edible oil in a deep tank through a manhold at the midlength of the tank. In order to fill the tank to maximum capacity, what trim should the vessel have?（）.
A.Down by the bow
B.Down by the stern
C.Down by either the bow or stern
D.In level trim
