All the holds which are to take cereals in bags must be so cleaned that they meet the requirements of the（）.

A.pass through the body with little absorbed by the system
B.help to prevent fatigue
C.quench thirst for only 2 hours
D.help to prevent seasickness

A.total and partial loss
B.4／4 collision liability
C.general average
D.all of the above

A.unsafe
B.safe
C.good
D.bad