We like Jack because he is a man ______everybody thinks is pleasant to _____.

A．who; talk

B．whom; get on with

C．who; get on with

D．whom; talk with

目前各国核潜艇和核动力水面舰艇采用的核动力装置绝大多数为（）。

A.沸水堆

B.压水堆

C.气冷堆

D.液态金属冷却堆