影响吸附的主要因素有(),(),(),(),()和()。
参考答案:吸附剂的性质;吸附质的性质;温度;溶液pH值;盐浓度;吸附物浓度和吸附剂用量
这些句式你掌握了吗?按要求改写下列句子。
1.She has to go home now. ( 改为否定句)
She ____ ____ to go home now.
2.They didn't talk any more in class. (改为同义句)
They talked ___ ___ in class.
3.I had to take a bus because it was too far. (就画线部分提问)
___ ____ you have to take a bus ?
4.David missed the early bus this morning. (改为同义句)
David ___ ___the early bus this morning.
5. The boy is very strong, He can carry the heavy basket.(合并为一个句子 )
The boy is ______ ______ to carry the heavy basket.
地球对物体的吸引力为月球对物体吸引力的6倍,宇航员把月球上的石头带到地球上,则石头的( )
A.重力变为6倍,质量变为6倍,密度也变为6倍
B.重力变为6倍,质量不变,密度不变
C.重力不变,质量不变,密度不变
D.重力不变,质量变为6倍,密度变为6倍