下列各选项中，不属于炼焦主要用煤的是（）。
A．气煤
B．肥煤
C．焦煤
D．无烟煤
参考答案：D
Tony was very unhappy for ______ to the party. [ ]
A. having not been invited
B. not having in vited
C. having not invited
D. not having been invited
滤油器能够滤除杂质颗粒的公称尺寸称（）。
A.过滤效果
B.过滤精度
C.通油能力
D.过滤范围
