Can I use pen? isn't here.
A:you; I
B:your; My
C:yours; Mine
D:your; Mine
①0.2mol/L的H2O2溶液,25℃;②0.2mol/L的H2O2溶液,MnO2,25℃;
③0.2mol/L的H2O2溶液,35℃;④0.2mol/L的H2O2溶液,MnO2,35℃.
世界上最大的半岛是
-- Mum, can I go to the zoo with Jack?
-- When your homework , you can.
在冬季,人们在冰面凿冰捕鱼利用的原理是在冰孔处( )