单项选择题
A.wood，paper B.textile C.A+B D.oil
For the duties （）in one emergency, one person may do mo...
单项选择题For the duties （）in one emergency, one person may do more than one job and one job may be done by more than one person.
A.assigning B.assign C.toassign D.assigned
Seven short blasts continued for one minute means （）.A....
单项选择题Seven short blasts continued for one minute means （）.
A. fire alarm B. boat alarm C. man overboard D. emergency alarm
Several sand boxes need （）.A. to repair and renewB. rep...
单项选择题Several sand boxes need （）.
A. to repair and renew B. repairing and renewing C. repair and renew D. repaired and renewed
