由植物细胞分化而成，具有营养作用的是（　　）

A．保护组织

B．上皮组织

C．营养组织

D．分生组织

The holding capability of an anchor is primarily determined by the（）.

A.shape of the anchor

B.stowage of the anchor on board

C.anchor's ability to dig in

D.size of the vessel and its draft