17. Emergency compressed air breathing escape sets onboard, shall have a duration of service no less than _____.

A. 20 minutes

B. 15 minutes

C. 10 minutes

D. 5 minutes

18114. According to SOLAS the breathing air apparatus that must be onboard shall have sufficient capacity for how many minutes of operation?

A. 20

B. 30

C. 45

D. 60

19 127. Where should you record the crude oil washing after completion?

A. Oil Record Book

B. Cow manual

C. Pumping Log

D. Inter plant manual

20 83. Shipboard Emergency Drills must be carried out at least_____?

A. Once every third year

B. Once a month

C. Once a year

D. Once a week

21,In anchoring orders , UP AND DOWN means____(老题库上的题)

A the chain is not upright

B the chain is tight

C the chain is upright

D the chain is slack