问题
选择题
You're too tired. You ______ have a good rest． [ ]
A．should
B．can
C．may
D．shouldn't
答案
答案：A
搜题请搜索小程序“爱下问搜题”
You're too tired. You ______ have a good rest． [ ]
A．should
B．can
C．may
D．shouldn't
答案：A
衰变成钋核
并放出一个粒子，其半衰期为3.8天．1g氡经过7.6天衰变掉的氡的质量，以及
