上颌基骨宽度的扩大，应在腭中缝完全融合前，一般在什么时机（）

A.不应大于12～15岁

B.不应大于15～17岁

C.不应大于10～15岁

D.不应大于12～17岁

E.不应大于15岁

In each inflatable liferaft，what equipment is provided to make quick，emergency，temporary repairs to large holes in the raft? （）

A.No equipment is provided

B.Glue and rubber patches

C.Several various-sized sealing clamps

D.Self-adhesive rubberized canvas patches