【单项选择题】
According to Maritime Labour Convention, 2006, The minimum age at the time of the initial entry into force of this Convention is （）years.
A、A.18
B、B.16
C、C.22
D、D.20
查看正确答案
A、vary their speed according to temperature and load B、start and come up to speed before air compression begins C、change speed according to overload demands D、reduce compressed air charge density
