A:How a great succe
B:What a great succe
C:How great succe
D:What great succe
如图,∠1和∠3是直线____ 、____ 被直线____所截得到的____ 角;
∠3和∠2是直线____ 、____ 被直线____所截得到的____ 角.
“没有规矩,不成方圆”揭示的道理是( )