贮存影片的最佳湿度为()。
A.40%—50%
B.50%—60%
C.60%
D.70%—80%
参考答案:C
We’ll have a________ holiday. Let’s go to the beach,shall we?
A.three-day
B.three days
C.three-days
D.three-days’
表达式“~9&9<<1|4”的值为( )。
A.0
B.4
C.5
D.22