【简答题】A.Because she is too weak to say much. B.Because she is not familiar with the area. C.Because she has lived here for a 'long time. D.Because she has never taken the bus before.
【简答题】任何一个数都有相反数,而且只有一个,正数的相反数一定是( ),负数的相反数一定是( ),0的相反数仍是0。两个互为相反数的和为零。
【多选题】消费者在预期商品销售数量为ne时,为第n个商品A愿意支付的价格为p(n , ne),下列说法正确的是( )。
【判断题】钻石石的解理平行( 111 ),是钻石面网间距最大的方向。
【单选题】下列说法正确的是( )
D.
互为相反数的两个数必定一个是正数,一个是负数