【简答题】(6)设 S="My Music" ,则 L en Str (s)= _ 。
【单选题】The people in the office suddenly started working because ______.
A.
they saw a stranger in the office
B.
they had finished their morning break
C.
no one wanted to talk to Marie
D.
the boss was about to arrive
【简答题】险种的生命周期是指险种的开发期( 1 )、( 2 )、( 3 )、衰退期。
【单选题】设G是群,e是幺元,a,b,cÎG,则下面关于群的性质描述错误的是( )
【单选题】设 G是群,e是幺元,a,b,c∈G,则下面关于群的性质描述错误的是
【单选题】设G是群,e是单位元,a,b,c∈G,则下面关于群的性质描述错误的是
【简答题】设 S="My Music" ,则 LenStr(s)= ______________ 。