The warmth of _____sweater will of course be determined by the sort of ___wool  used.

A．the, the

B．the ,/

C．/, the

D．/,/

针对二尖瓣关闭不全的介入治疗包括（）

A.经皮二尖瓣修补术

B.经皮人工二尖瓣支架植入术

C.经皮二尖瓣瓣环成形术

D.经皮二尖瓣球囊扩张术

E.PBPV