在选择过滤介质时需考虑的因素有()。
A.过滤粒子的大小及操作条件
B.滤浆的腐蚀性
C.对强度和耐磨性的要求
D.以上三项均需考虑
参考答案:D
心藏神的物质基础是什么?()
A.心气
B.心阳
C.心血
D.心阴
His performance in the play didn't reach the required standard by the director, __, he failed.
A.in words
B.in another word
C.in a word
D.in other words