详细测设所采用的桩距与圆曲线的半径有关,常有以下几种方法()
A.假定桩距法
B.固定桩距法
C.整桩号法
D.整桩距法
参考答案:C, D
With modern equipment,many mysteries have ________ to light in recent years.
A.bought
B.come
C.thrown
D.appeared
若曲线y=ax2-lnx在点(1,a)处的切线平行于x轴,则a= .