下列黄酮类化合物中,亲水性较大的是()
A.黄酮
B.黄酮醇
C.异黄酮
D.查耳酮
E.花色素
参考答案:E
The children are full of ______. They have been playing all day long without resting.
A.energy
B.power
C.force
D.strength
离子交换处理中,双层床再生剂利用率高、比耗小,但制水成本高。()