受力钢筋的绑扎接头，不应集中在（）内。
参考答案：同一断面内
The little boy was so careless with his spelling that he often letters from words.
A．left off
B．left behind
C．left out
D．let alone
过点M（1，1，1）和直线L：x=y-1=z+1的平面方程是（）。
A.x-2y+z=0
B.2x-y-z=0
C.x+2y-z=2
D.2x+y-z=2
