---What’s your best friend like?   ---              .

A．He is fine. Thank you.

B．He is a doctor.

C．He likes watching TV.

D．He is helpful and generous.

对左心功能判断最有价值( )

A．超声心电图检查
B．X线心脏三位片检查
C．冠状动脉及心室造影检查
D．漂浮导管检查
E．心电图运动负荷试验检查