【单选题】The children are having a good time, ______ with sand, others with toys.
B.
some of them are playing
【单选题】定义了数组seg[4]= {ox01,0x02,0x03,0x04}; 则seg[2] = ( )
【单选题】Some parents are always comparing their children __________other children. [ ]
【单选题】测验1 逻辑表达式 A + BC 等价的逻辑表达式为( )
【单选题】'Part-time' children______.
A.
spend some of their time with their half brothers and some of their time with their half sisters
B.
spend all of their time with one parent from the previous marriage
C.
are shared between the two former spouses
D.
cannot stay with 'full-time' children
【简答题】一台三相异步电动机的额定功率P N 是指额定运行时的______功率,如果撤换其定子绕组,将每相绕组匝数减小了,在电源电压不变的条件下,气隙中的每极磁通将______。