单项选择题
A.When B.How C.If D.Should
（）the packing is the same，the lots are different in mar...
单项选择题（）the packing is the same，the lots are different in marks.
A.For B.Since C.Because D.Although
（）the morning from 0800 to 1200 Chief Officer is on dut...
单项选择题（）the morning from 0800 to 1200 Chief Officer is on duty.
A.On B.In C.At D.During
（）should you do first when heaving up the anchor.A.Enga...
单项选择题（）should you do first when heaving up the anchor.
A.Engage the wildcat B.Release the brake C.Release the pawl D.Engage the motor
