问题
选择题
______ of the apples is big and red. [ ]
A. Each
B. Neither
C. Every
D. Either
答案
答案：A
搜题请搜索小程序“爱下问搜题”
______ of the apples is big and red. [ ]
A. Each
B. Neither
C. Every
D. Either
答案：A
则该原子核内有____个质子，核外有____ 个电子，最外层电子数为______，在化学反应中易____电子。