我国政府规定负责港口设施保安评估、保安计划批准以及船/港界面活动的行政主管机关是交通部海事局
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Thiscarisveryexpensive.Youhavetopayhalfamilliondollars________it.
Ittookafewsecondsforhereyesto________tothedarkness.
Thisisanimportantproblem_______toofewsocialscientistshaveresearched.
Ithinkhisfailureintheexperimentresulted________hiscarelessness.
Moderneconomics________thecountry’sagriculturalpolicies.