食管癌术后并发吻合口瘘伴胸腔感染，引流液的颜色常为（）。
A.红色
B.淡红色
C.乳白色
D.浑浊
E.清亮
参考答案：D
Though Mark wasn't well educated, his common _____ guided him through a life.[ ]
A. sense
B. ground
C. place
D. practice
电造给矿输采用（）
A．链式输送机
B．刮板皮带运输机
C．螺旋
