（）of the following items is not in the charge of Chief Officer in repairing operation.

A.hull cleaning

B.derusting and painting

C.the maintenance of boiler

D.docking and undocking

通过获取某一目标的信息特征来确定其存在的形状、时空位置和真伪等属性的技术手段，称为信息获取技术。（）