题目内容

The entries in the Official Logbook must be signed by the Master and（）.

A. the Chief Engineer
B. the person about whom the entry concerns
C. one other crew member
D. No other signature is required

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A. spoken；written
B. speaking；written
C. speaking；writing
D. speak；write

A. 爆炸极限和自燃点是评定气体火灾危险性的主要指标
B. 评定可燃固体火灾危险性最直接的指标是蒸气压
C. 熔点低的固体易蒸发或气化，燃点也较低，燃烧速度也较快
D. 在评定时，还可以从危险性、毒害性等方面进行分析

A. 垂直
B. 平行
C. 倾斜
D. 平行或垂直