【简答题】The number 2008 is a special number, I think,that will be remembered hy the Chinese forever. A.which B what C one D.it
【单选题】The number of older Americans with sleep problems is not small.
【判断题】圆柱形弹性元件受力产生的应变大小与圆柱的长度无关
【简答题】试写出井身结构设计中预防井漏、井喷的物理关系式及其工程意义。