若四个数0,a,b,5成等差数列,那么a+b=( )。
5
These regulations the board approved at the meeting yesterday _____ everyone without exception.[ ]
A. commit to
B. tend to
C. contribute to
D. apply to
浓缩LS不足下列说法正确的是()。
A、影响产品酸的浓度
B、影响冷凝液的回收
C、影响浓缩的生产能力