2021职业技能鉴定海船海员证专项练习每日一练(07月10日)

1. [单选题]高膨胀泡沫，多用于______灭火。

A. 机舱、油泵间
B. 甲板
C. 物料间
D. 货舱

2. [单选题]下列情况中不会造成制冷压缩机排气温度过高的是( )。

A. 气阀漏泄
B. 压缩机运转时间太长
C. 安全阀阀漏
D. 系统中空气太多

3. [单选题]心绞痛部位在______。

A. 胸骨前
B. 胸骨后
C. 腰椎前
D. 颈椎后

4. [单选题]If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the

A. cylinder compression pressure may not be high enough
B. cylinder compression temperature may be too high
C. fuel oil injection pressure may not be high enough
D. scavenge and purge process is incomplete

5. [单选题]半圆法150°SE换算成圆周法应为：()

A. 150°
B. 030°
C. 330°
D. 210°

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