重视提高船员的基本素质和安全管理水平就可以最大限度地降低海上事故，保障船舶安全和海洋环境。
参考答案：对
已知某溶液中存在较多的H+和SO42-，则该溶液中还可以大量共存的离子组是（ ）
A．Al3+、CO32-、Cl-
B．Mg2+、Ba2+、Cl-
C．Mg2+、Fe2+、NO3-
D．Na+、NH4+、Cl-
单句改错
1. To my delighted, I passed the examination.
2. Hearing the news, he feels very delighting.
3. It is delight for me to help those poor children.
4. They were delighted at that the conference had been called off.
