当发现已喷锚区段的围岩有较大变形或锚杆失效时,应立即在该区段增设加强锚杆,其长度不小于原锚杆长度的()倍。
A.1
B.1.5
C.1.8
D.2
参考答案:B
There were _______among the doctors about the best way to treat the disease. [ ]
A. disadvantages
B. disagreements
C. disappointment
D. difference
在平面直角坐标系中,点P(-2,3)在( )
A.第一象限
B.第二象限
C.第三象限
D.第四象限