简述文案调查的局限性。

A. 业务经办
B. 业务主办
C. 特殊主办
D. 业务主管

A. kept in a locker
B. secured at each end of the boat with a lanyard
C. kept next to the boat coxswain
D. kept in the emergency locker on the ship and brought to the lifeboat when needed

A. 维生素A
B. 维生素B
C. 维生素C
D. 维生素D