A:
B:
C:
D:
There aren't ____(some/ any)chairs for me.
看谁都能算对。
11-6=____
13-6= ____
16-7= ____
16-8= ____
11-4= ____
12-9=____
15-8=____
14-5=____
N2(g)+2O2(g)═2NO2(g);△H=+67.7kJ/molN2H4(g)+O2(g)═N2(g)+2H2O(g);△H=−534kJ/mol
下列判断正确的是( )