怎样计算农村户用沼气池主池取土深度？
参考答案：
主池取土深度＝蓄水圈高＋拱顶厚度＋拱顶矢高＋池墙高度＋池底矢高＋池底厚度。
单词拼写(共8小题；每小题l分，满分7分)
小题1:That professor has s______________ from cancer for almost one year.
小题2:There were 2,000 people p____________ at the meeting yesterday.
小题3:He p__________ to stay home rather than go camping, so we went without him.
小题4:To tell you the truth, I’m d_________________ to leave my present work and set up a company of my own.
小题5:The production plan was finished ahead of s_______________ after the staff worked day and night.
小题6:He is a r_______________ boy so we can rely on him.
小题7:J____________ from his appearance, the manager must be over fifty.
火车开始刹车后经过7s停下来，最后1s内通过的位移是2m，则火车的加速度______m/s2，火车的初速度______m/s（设火车刹车过程做匀减速直线运动）．
