江西历史上的书院都是私人所办。
参考答案：错
A．电容增大反映h增大
B．电容增大反映h减小
C．将金属棒和导电液体分别接电源两极再断开后，液体深度变化时导电液与金属棒间的电压增大反映h减小
D．将金属棒和导电液体分别接电源两极再断开后，液体深度变化时导电液与金属棒间的电压增大反映h增大
--- How _____ hours do you sleep a day?
--- Well, about eight hours. But how _____ sleep do we students really need?
A．many; many
B．much; much
C．much; many
D．many; much
