单项选择题
在尼柯尔斯基方程式中，K值为离子交换常数， K＞1说明树脂对交换离子吸引力( )
A．大于平衡离子
B．小于平衡离子
C．等于平衡离子
D．无法判断
在尼柯尔斯基方程式中，K值为离子交换常数， K＞1说明树脂对交换离子吸引力( )
A．大于平衡离子
B．小于平衡离子
C．等于平衡离子
D．无法判断
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单项选择题
The average time between two high waters is 12 hours and 25 minutes because this is the time it takes for ______.
The average time between two high waters is 12 hours and 25 minutes because this is the time it takes for ______.
A．A. The sun to be at the opposite side of the moon
B．B. The moon to be at the opposite side of the earth
C．C. The moon to be at its apogee
D．D. The sun and the moon to be on the same side