关于电磁感应现象，下列说法中正确的是[ ]

A.必须使导体的运动方向与磁感线方向垂直，才能产生感应电流

B.必须使导体的运动方向与磁感线方向平行，才能产生感应电流

C.当导体运动方向与磁感线方向不垂直时，也可能产生感应电流

D.当导体运动方向与磁感线方向不垂直时，一定不可能产生感应电流

You are ordering ship’s stores. Which statement is TRUE?（）

A.Stores such as line，rags，mattresses，linens，etc. must be treated to be fire retardant

B.Stores certified for use on uninspected vessels may be identified by the certification number used by Underwriter's Laboratories

C.A portable container of a flammable liquid used as fuel for portable auxiliary equipment must be stowed in a paint locker or at a designated open location

D.Acetylene may be in a ship's storeroom in quantities not exceeding 6000 cubic feet