根据规律可知第⑩个等式是1111120=11+11120.
The earth is our home, we must _____ the land, air and water clean[ ]
A. get
B. let
C. keep
D. take
挡墙施工时,泄水孔间距偏差控制在()。
A.±20mm
B.±15mm
C.±10mm