A:HCl
B:H2O2
C:C2H4
D:CH2Cl2
—Can you come to my birthday party tomorrow?
—__________. I have a lot of homework to do.
往AgNO3和Cu(NO3)2的混合溶液中加入一定量的铁粉,充分反应后过滤,向滤渣中加入稀盐酸,无气泡产生.根据上述现象,你能得出的结论是( )
What bad weather we have! It has rained ______ yesterday.