回转式空气预热器一般烟气的流通面积占整个截面的()。A、30% B、50% C、80 发布时间:2017-09-30 00:38 │ 来源:www.tikuol.com 题型:单项选择题 问题: 回转式空气预热器一般烟气的流通面积占整个截面的()。A、30%B、50%C、80%
题型:单项选择题 The shipment was delayed because you had failed ______ the necessary space.A. to order B. to place C. to take D. to book 查看答案