The manner in which a telephone is answered gives the image of the organization, so     

polite and pleasant when answering the telephone.

A．being

B．be

C．to be

D．having been

右心房肥厚、扩张时，心电图表现错误的是（）

A.P波尖而高耸

B.P波振幅≥0.25mV

C.P波高尖以Ⅱ、Ⅲ及aVF最为突出

D.P波宽度<0.11s

E.高尖的P波，称为“二尖瓣P波”