()是一种用以表达构思和交流意见的技术语言,是施工和生产的重要依据。
A.安全专项方案
B.施工组织设计
C.施工预算
D.图纸
参考答案:D
We should give love to the children _ lost their parents in the earthquake.[ ]
A. who
B. whom
C. those
D. which
试述发电机氢压下降的特征、原因和处理方法?