浓度失调导致
A．细胞内液量的改变B．细胞外液量的改变C．体液量的改变D．渗透压保持恒定E．渗透压发生改变
参考答案：E
—Good morning. A table for two?
—________ We are looking for a hotel.
A．Sorry to hear that.
B．It doesn't matter.
C．No, thank you.
D．Yes, sounds good.
函数f（x）=|2x-1|在点处的导数是（）
A．0
B．
C．2
D．不存在
处的导数是（）