光源在给定的方向上单位立体角内所发生的光通量,称()强度。
参考答案:发光
翻译画线词组
(1)________He gave all his land away to the city.
(2)_________He is sure to give away your secrets.
(3)_______Have you given the money back toJane yet?
(4)___________The mother gave in and bought a toy for her child.
(5)_______These wild flowers gave off a nice smell.
(6)______The headmaster will give out diplomas.
(7)________This device gives out flashes of light in the fog.
(8)_______Our supply of wine has given out.
(9)_________I wish I could give up sweets.
(10)________Don't give up halfway.
急性胆囊炎在胆管系统显像中胆囊表现为()
A.于10min前显影
B.于20min前显影
C.于30min前显影
D.延迟1~2h显影
E.胆囊持续不显影