【简答题】解方程.Χ:0=0.着:0 &n1sp;&n1sp;&n1sp;&n1sp;&n1sp;&n1sp; 0Χ+ 1 0 = 1 0 .
【简答题】suddenly stop speaking or stop what you are doing, because sth. has surprised you or you have just thought of sth. :___________________
【单选题】为了安全平行双跑楼梯的梯井宽度一般以 ( ) 为宜。
【单选题】为了安全,平行双跑楼梯的梯井宽度一般在( )之间为宜。