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)

case函数的格式正确的是（ ） A: case(depth<=70 "Shallow" depth>70 AND depth<=300 "Mid" depth>300 "Deep") B: case(depth<=70, "Shallow", depth>70 AND depth<=300, "Mid", depth>300, "Deep") C: case(depth<=70, "Shallow", depth>70 && depth<=300, "Mid", depth>300, "Deep") D: case(depth<=70, "Shallow", depth>70 && depth<=300, "Mid", depth>300, "Deep")

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．

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,______ ,______ ,______ .

It took western companies many years to ______ from the oil crisis of the mid-70s. A: regain B: recover C: retain D: refresh

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: $\mid A+B\mid=-1$

用于获得字符串S从第3个字符开始的两个字符的函数是（ ）。 A: Mid(S，3，2) B: Middle(S，3，2) C: Left(S，3，2) D: Right(S，3，2)

在字符串S中，从第二个字符开始获得4个字符的子字符串函数是( )。 A: Mid(S,2,4) B: Left(S,2,4) C: Right$(S,4) D: Left$(S,4)