A:某无色溶液中:Al3+、Cu2+、SO42-、Cl-
B:由水电离的c(H+) = 1×10-12 mol·L-1的溶液中:Ba2+、K+、Cl-、NO3-
C:c(OH-)/ c(H+)=1012的溶液中:Na+、Mg2+、NO3-、Cl-
D:加入铝单质能放出氢气的溶液中:Mg2+、NH4+、Cl-、K+
= (位) ____
答:还缺____位老师。
用括号内所给动词的适当形式填空,并将答案写在答题卡标有题号的横线上。⑴We all love Mr Hu who is very kind and ____ (treat) us as his own children.⑵____ you____ (hand) in the report today? Yes, I put it on your desk shortly after lunch .⑶The cinema we used to go to____ (turn) into a hotel by the government in two years⑷Timmy is active. He has many hobbies from____ (collect) stamps to outdoor-activities .⑸The accident was so bad that all the doctors except Dr Li____ (save) the patients in danger at that time,⑹He told us the boat would not float in the direction of wind if it____ (control).⑺The old man was honoured for what he____ (do) for the poor since 10 years ago..⑻The girl thought that her decision ____ (affect) her future study in college and job as well.
在平面直角坐标系中,线段AB的端点坐标为A(2,4),B(4,2),直线y=kx-2与线段AB平行,则k的值是 ( )