颈静脉搏动见于( )
A．肺动脉高压B．二尖瓣关闭不全C．主动脉瓣关闭不全D．三尖瓣关闭不全E．甲亢
参考答案：D
28．— Is Mike going there by bus?
— He ought to, but he ________ not. He likes riding his bike.
A．must
B．may
C．need
D．Can
中和100ml0.125mol/LBa（OH）2溶液，需要0.250mol/LHCl溶液（）。
A、125ml
B、100ml
C、75.0ml
D、50.0ml
