—Mr Smith, I wonder if I could take the Friday off?

—_______? It’s a bit difficult with so many people away on holiday, you know.

A．Why are you doing so　

B．Do you really have to

C．Where are you going

D．Do you feel it necessary

关于顺钟向转位的描述正确的是（）。

A.QRS电轴向右偏移

B.QRS电轴向左偏移

C.正常过渡区波形出现在V₁、V₂导联上

D.正常过渡区波形出现在V₅、V₆导联上

E.常见于左心室肥厚