无向图G为欧拉图，当且仅当G是连通的，且G中无__________结点。
参考答案：奇数度
立正时两脚跟靠拢并齐，两脚尖向外分开约（）度。
A、75
B、60
C、45
D、30
The coat made of this kind cloth _____ well. I think it is worthy _______.
A．washes; buying
B．is washed; buying
C．washes; to be bought
D．is washed; to be bought
