化学式
电离平衡常数(25℃)
HCN
K=4.9×10﹣10
CH3COOH
K=1.8×10﹣5
H2CO3
K1=4.3×10﹣7、K2=5.6×10﹣11
—What language does the woman speak? —She speaks . She' s from Australia.
选出下列各句中没有语病的一项( )
There aren't any books pens in her bag.
45÷5=____
70÷8=____……____
42-8=____
65÷9=____……____
6×8=____