如何调整蒸汽品质?
参考答案:当化学取样蒸汽品质不合格时,可以开大锅炉连续排污,降低锅水含盐量,或提高给水品质,在用户许可时降低锅炉蒸发量或汽泡水位降至0~50mm等措施。
—______ do you go to school every day?
—By bike.[ ]
A. Why
B. What
C. When
D. How
Grapes usually have seeds in the middle, _____?[ ]
A. aren't they
B. isn't it
C. don't they
D. isn't it