1. [单选题]每艘救生艇应配备有效的雷达反射器：
A. 1具
B. 2具
C. 4具
D. 3具
2. [单选题]Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes. The governor characteristic used to accomplish this is known as _______.
A. actuation
B. sensitivity
C. compensation
D. promptness
3. [单选题]下列叙述中错误的是()。
A. 锅炉安全阀应有手动开启装置
B. 锅炉安全阀必须由船检局试验调整
C. 锅炉安全阀通常必须有两只以上
D. 锅炉安全阀的开启和关闭压力可经船员调整
