取字符串s的倒数第i个字符，正确的表达式是（ ）。 A: Mid(s,i,1) B: Mid(s,Len(s)-i,1) C: Mid(s,Len(s)-i-1,1) D: Mid(s,Len(s)-i+1,1)

All of the following statements are true EXCEPT ____. A: young people couldn't afford their own tuition in the 1970's B: it's difficult for graduates from colleges to find a job in the 1970's C: fewer parents could afford to send their children to college because of the recession in 1970's D: Birthrate dropped in the 1970's because of the recession

______ in the 1970’s that you started to learn Russian?

设S="中华人民共和国",表达式Left(S,1)+Right(S,1)+Mid(S,3,2)的值为()

The Mid­Autumn Festival dating back in China’s Tang Dynasty．

Since the mid-1970s, the enrollment of o... rate of 3.9 percent

On which year's Earth Day, we celebrate people's ingenuity A: 1970 B: 2020 C: 2018 D: 2008

已知三阶矩阵$A$满足$\mid A-E\mid=\mid A-2E\mid=\mid A-3E\mid=0$，则$\mid A\mid$=( )。 A: $4$ B: $6$ C: $12$ D: $3$

The acronym “MICE” came into being in the mid 1990s, it's fully recognized that the term MICE relates to meetings,______ ,______ ,______ .

设$A,B$是$n$阶正交矩阵，且$\mid A\mid=-\mid B\mid$，则( ). A: $A+B$可逆 B: $A+B$不可逆 C: $\mid A+B\mid=1$ D: $\mid A+B\mid=-1$