巷道的围岩处于（）状态。
A.二向应力
B.三向应力
C.单向应力
参考答案：B
Once he has ______ nothing can change his mind. [ ]
A. made up his mind
B. decided his mind
C. determined his mind
D. made his mind
2010版承兑汇票票号8位流水号的印刷油墨为（）
A.无色荧光油墨
B.渗透性油墨
C.水溶性防伪油墨
D.黑色防涂改油墨
