问题
选择题
He suddenly remembered that ___at home.
A．he forgot his schoolbag
B．he left his schoolbag
C．his schoolbag had been forgotten
D．his schoolbag had been left
答案
答案：D
搜题请搜索小程序“爱下问搜题”
He suddenly remembered that ___at home.
A．he forgot his schoolbag
B．he left his schoolbag
C．his schoolbag had been forgotten
D．his schoolbag had been left
答案：D
=1.33V，当氢离子浓度为10mol/l，其余离子浓度均为1.0mol/l时，的值为（）。