车门的中心处可承受90kg的横向载荷，而挠度不允许大于6.2mm。
参考答案：对
P，P+10，P+20都是素数（质数），那么P+2005=______．
I ________ myself in my studies. In return, I gained great success. [ ]
A. placed
B. had
C. laid
D. buried
