单项选择题
（）the canal transit, the radar was operating.
A.At B.In C.During D.With
单项选择题 （）the morning from 0800 to 1200 chief officer is on duty.
单项选择题 （）the packing is the same, the lots are different inmarks.
单项选择题 （）the repeater compass with the master compass, please.
