魏源在《海国图志·大西洋英吉利国》中介绍:“……用兵和战之事,虽国王裁夺,亦必由

_______,the headmaster rose to indicate that the conversation was ________. [ ]

A. At an end;in an end          

B. In the end;at an end  

C. In an end;at the end          

D. At an end;in the end

Shall we sit up here on the grass or down there near the water? （）

A.I'd rather stay here if you don't mind. 

B.Sorry, I don't like neither. 

C.Certainly, why not?

D.Yes, we like these two places.

三型机做热靶时如果大门没关闭，可能造成（）。

A.热靶曲线呈竖直线

B.热靶曲线呈水平直线

C.热靶曲线呈一个点

D.探头输出与天空值相同

阈值

门静脉高压症的临床表现不包括

A．呕血
B．黑便
C．腹水
D．脾肿大
E．肝区疼痛