在“然而，是竹也，不苦口，不瞑眩”中，“瞑眩”之义为（）

A.昏暗不明

B.头晕目眩

C.糊里糊涂

D.朦胧一片

In each inflatable rescue boat , what piece of equipment is provided to make quick , emergency,temporary repairs to a large hole in a raft?（）.

A.No equipment is provided

B.Glue and rubber patches

C.Several various-sized sealing clamps

D.Self-adhesive rubberized canvas patches