用天然骨料时,为减少弃料、减少总开挖量,常采取哪些措施?
参考答案:
①调整混凝土的配合比设计;②搭配人工骨料。
There are more ( ) in the board.
A.woman directors
B.woman as director
C.women directors
D.women director
上海NAVTEX播发台的识别字母为()
A、N
B、R
C、Q
D、M