救治缓慢性心律失常，暂时性提高心室率的首选药物是（）

A.异丙肾上腺素

B.普罗帕酮

C.胺碘酮

D.沙胺丁醇

E.利多卡因

The steering oar in a lifeboat is usually referred to as the（）.

A.bumpkin oar

B.stroke oar

C.sweep oar

D.becket oar