把灼烧减少固形物当作水中实际有机物的含量,这对含盐低的水,误差不大。()
参考答案:对
漫画给我们的主要反思是( )
A.应该善于赞赏父母
B.节约用水人人有责
C.要善于与父母沟通
D.子女应该孝敬父母
—Could you tell me _____? I must find him.
—Sorry, I have no idea. But he was here just now. [ ]
A. where Tom was
B. where has Tom gone
C. where can I find Tom
D. where Tom is