【简答题】It ______ not be his car.
【单选题】定义语句“char c;” ,要将字符b赋给变量c,则下列赋值表达式正确的是_____。
【单选题】f:A→B为从A到B的一个函数,下列说法正确的有
B.
函数要求集合A、B是非空的数集,而映射只要求A、B是两个非空集合就可以了
【单选题】It was quite a serious mistake, ____caused by carelessness.
【单选题】定义语句“char c;” ,要将字符b赋给变量c, 则下列赋值表达式正确的是( )。
【单选题】If it for his invitation the other day, I should not be here now.