A:CH3COOH
B:Cl2
C:NH4HCO3
D:SO3
——Can you promise _______ late ______ school again, Tom?——Yes, of course I can.
— Do you think I should wear an orange shirt today?
— Yes. orange can bring you good luck, it is good for your interview.
某人用200牛的力提起了350牛的重物,那么他不可能使用了 ( )