初步修整可卸代型根部形态应在颈缘下方约（）
A.0.5mm
B.1.0～1.2cm
C.7mm
D.5mm
E.2mm
参考答案：E
Today is the best day of my life! All my years of training as an explorer have finally ______! [ ]
A. paid off
B. sent off
C. given off
D. fallen off
住宅平面系数每提高2%，一般来讲可减少投资( )。
A．1%
B．1.2%
C．1.4%
D．1.6%
