国产天然气氨压缩浅冷装置制冷系统正常停车时，应关闭氨蒸发器供液阀，使蒸发器氨压力（）
A、增大
B、减小
C、不变
D、归零
参考答案：D
It is required that the football match___________put off ________ the bad weather.
A．be; thanks to
B．be; due to
C．was; thanks to
D．was; owing to
眼动脉起自（）
A.大脑前动脉
B.大脑中动脉
C.大脑后动脉
D.颈内动脉
E.颈外动脉
