水冷壁、省煤器腐蚀状态检查和评级应该是在清洗除去沉积物后再进行()
参考答案:对
砂轮的组织是指结合剂气孔两者之间的比例关系。
—Which would you prefer, beer or juice?
—_______ will do. It doesn’t make any difference to me.
A.Either
B.Neither
C.All
D.Any