单项选择题
A. port state B. port area C . port control D. port authority
松出（）A. slack awayB. take inC. hold onD. let go
单项选择题松出（）
A. slack away B. take in C. hold on D. let go
海关官员（）A. customs officerB. chief officerC. immigration ...
单项选择题海关官员（）
A. customs officer B. chief officer C. immigration officer D. second officer
旗（）A.flightB.flyC.fireD.flag
单项选择题旗（）
A.flight B.fly C.fire D.flag
