支撑安装位置不得随意变更,并应使围檩与挡土桩墙结合紧密。()与坑壁间的回填土应分层回填夯实。
A.挡土板
B.板桩
C.挡土板或板桩
D.挡土板和板桩
参考答案:C
全站仪测量高差的原理与水准仪相同。()
The secretary worked late into the night, ___________ a long speech for the international conference.
[ ]
A. to prepare
B. prepared
C. preparing
D. was preparing