简述训访模式的主要特点。

A. the International Convention for the Safety of the Life at Sea
B. the International Convention for the Prevention from ships
C. the International Convention on Standards of Training, Certification and Watch keeping for Seafarers
D. the International Convention for the Control and Management of Ship’s Ballast Water and Sediment

A. 正确
B. 错误

A. 用干砂复盖着火的金属钠
B. 用泡沫灭火器喷向金属钠
C. 用二氧化碳灭火器喷向金属钠

A. 结构
B. 演示图像
C. 非语言表达
D. 技巧