下列物质中，只含有非极性共价键的是[ ]
A．H2O2
B．I2
C．CaC12
D．NaOH
答案：B
—Where is my football?
—It’s the table the floor.
A．on;under
B．on;on
C．under;under
D．under;on
纸张耐折度
