自河源沿河道至河口的长度称为（）。
参考答案：河流长度
— What do you think of the report Mr. Green gave us last week?
— I think it’s _______, but someone thinks it’s much too _______.
A．enough wonderful; boring
B．wonderful enough; bored
C．wonderful enough; boring
D．enough wonderful; bored
在配位滴定中为什么常常需要使用缓冲溶液
