油井结蜡时示功图的图形四个角均呈（），上负荷线超出理论负荷线。
A.四边形
B.圆形
C.长方形
D.三角形
参考答案：B
If his spare time was ____ aside for relaxation,he was____ to have a healthy life.
A．set;bound
B．to set ;bound
C．to be set;bounded
D．setting;bounded
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