问题
选择题
2002年诺贝尔物理学奖中的一项,是奖励美国科学家贾科尼和日本科学家小柴晶俊发现了宇宙X射线源.X射线是一种高频电磁波,若X射线在真空中的波长为λ,以h表示普朗克常量,c表示真空的光速,以E和m分别表示X射线每个光子的能量和质量,则( ) A.E= B.E= C.E= D.E= |
答案
答案:D
2002年诺贝尔物理学奖中的一项,是奖励美国科学家贾科尼和日本科学家小柴晶俊发现了宇宙X射线源.X射线是一种高频电磁波,若X射线在真空中的波长为λ,以h表示普朗克常量,c表示真空的光速,以E和m分别表示X射线每个光子的能量和质量,则( ) A.E= B.E= C.E= D.E= |
答案:D
完形填空 | ||||
It's Sunday and it is a 1 day. People don't stay 2 home. They go to parks and beaches or drive(开车) to the country(乡村). Now we 3 at the seaside(海边).There 4 lots of people on the beach. Some 5 . Some are 6 on the sand and bathing(沐浴) 7 the sun Over there a group of men and women are sitting under a beach umbrella(雨伞). They are 8 and laughing. Not far from them, a little boy is playing 9 water. The people are really 10 . | ||||
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