焦炭塔底盖基本设计数据？
参考答案：
直径1600
底盖重1623kg
底盖法兰15CrMoIV
螺栓规格M30×3×350
金属环垫片0Cr13II
______ some of the questions ______,the man said good-bye to us.
A．Leave;unanswered
B．Leaving;unanswered
C．Left;to be answered
D．Leaving;unanswering
在装有黑色围棋的盒子中摸出一颗棋子，摸到一颗白棋是（ ）事件．
