债权人转让权利的通知,在取得债务人的同意后可以撤销。 ( )
参考答案:UNKNOWN
The humans are destroying nature day by day,__________of course,will cause severe punishment from it sooner or later.
A.who
B.when
C.on which
D.which
气体混合物冷凝时只有相的变化而没有温度的变化。