The spacing between adjacent spurs in river training work is generally kept between ______ times the spur length.

The spacing between adjacent spurs in river training work is generally

1.	The spacing between adjacent spurs in river training work is generally kept between ______ times the spur length.
A.	1.5 to 2.5
B.	1 to 2
C.	2 to 2.5
D.	2.5 to 3.5
Answer» D. 2.5 to 3.5