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举一反三
【单选题】基坑开挖前的回弹观测，宜采用水准测量配( )。
A.
以铅垂钢尺读数的钢尺法
B.
辅助杆垫高水准尺读数的辅助杆法
C.
辅助杆垫高水准尺读数的钢尺法
D.
以铅垂钢尺读数的辅助杆法
【多选题】减小弯曲件回弹的措施（）。
A.
改进弯曲件的设计，避免使用过大的弯曲相对半径r/t
B.
采用校正弯曲代替自由弯曲
C.
对冷作硬化的材料须先退火，使其屈服点降低，必要时采用加热弯曲
D.
合理设计弯曲模
【单选题】Passage Three In recent years there has been an increasing number of large oil spills. These spills, some of which have occurred directly at the site of extraction and others during tran...
A.
immediately
B.
after quite a long time
C.
few years later
D.
after several months