基本模式如下:O1 O2 O3 O4 X O5 O6 O7 O8O9 O O O O O O O是哪种准实验设计:
基本模式如下:O1 O2 O3 O4 X O5 O6 O7 O8O9 O O O O O O O是哪种准实验设计:
（7）ling/o：
（7）ling/o：
7 O' clock表示时间 ______
7 O' clock表示时间 ______
The plane ______ off at 7 o’clock.
The plane ______ off at 7 o’clock.
They are____(leave) only at 7 o’clock.
They are____(leave) only at 7 o’clock.
Time of the party: on 50______ at 7 o’clock in the evening.
Time of the party: on 50______ at 7 o’clock in the evening.
He ____(get) up at 7 o’clock in the morning.
He ____(get) up at 7 o’clock in the morning.
下列( )溶液是pH测定用的标准溶液。 A: 0.05mol/LC₈H₅O₄K B: 1mol/L HAc− +1m ol/LNaAC C: 0.01mol/LNa2B O7⋅10H2O （硼砂） D: 0.025mol/LKH2 PO4+0. 025mol/LNa2HPO;
下列( )溶液是pH测定用的标准溶液。 A: 0.05mol/LC₈H₅O₄K B: 1mol/L HAc− +1m ol/LNaAC C: 0.01mol/LNa2B O7⋅10H2O （硼砂） D: 0.025mol/LKH2 PO4+0. 025mol/LNa2HPO;
用K2 Cr2 O7 法测定Fe2+，可选用下列哪种指示剂
用K2 Cr2 O7 法测定Fe2+，可选用下列哪种指示剂
Lily gets up at 6 o'clock in the morning. Lisa gets up at 7 o'clock in the morning.
Lily gets up at 6 o'clock in the morning. Lisa gets up at 7 o'clock in the morning.