影响混凝效果的因素只与混凝剂的用量有关，与原水水质、PH等无关。（）
参考答案：错
The reason he did not come was he was ill.
A．that; why
B．that; that
C．why; that
D．why; which
组织一次“读一本好书”的活动，你怎么做
