问题
选择题
It's ________ good feeling for people to a
dmire the Shanghai World Expo that
gives them ________
pleasure. [ ]
A. /; a
B. a; /
C. the; a
D. a; the
答案
答案：B
搜题请搜索小程序“爱下问搜题”
It's ________ good feeling for people to admire the Shanghai World Expo that gives them ________
pleasure. [ ]
A. /; a
B. a; /
C. the; a
D. a; the
答案：B
，带电粒子在轨迹圆上运动的周期之比
。设衰变过程释放的核能全部转化成射线粒子和反冲核的动能，已知该衰变过程前后原子核的质量亏损为m。
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