【简答题】We will revert ______ this matter with you as soon as the supply position improves.We trust the above will be acceptable to you and await ______ keen interest your trial order.
【简答题】1某地3月6日下雨; 2函数 y = a x ( a > 0且 a ≠1)在定义域上是减函数; 3实数的绝对值小于0; 4 a , b ∈ R ,若 a + b = 0,则 a 2 = b 2 ; 5某人射击8次恰有4次中靶. 其中必然事件是 ________,不可能事件是________,随机事件是________.