在焊接铝板时,如果铝板表面有涂层,应用装有粒度为80号砂轮的砂轮机磨去宽度为()范围内的涂层,让金属裸露出来。
A、10mm
B、20mm
C、30mm
D、40mm
参考答案:B
______ the aids from the outside, the positive attitude of the disaster-stricken people _____ the key role in the reconstruction of their destroyed towns and villages. [ ]
A. Except for; plays
B. Besides; play
C. Apart from; plays
D. Except; play
解热镇痛药用于止痛服用
A.1:(2000~5000)高锰酸钾溶液B.药用炭二份,鞣酸、氧化镁各一份的混合物5g加温水500mlC.3%过氧化氢溶液10ml加入100ml水中D.1%~2%氯化钠溶液或生理盐水E.3%~5%鞣酸溶液上述洗胃液中: