下列物质中属于非电解质的是( )
A.氯化氢
B.氯水
C.铜
D.二氧化碳
答案:D
If you don’t know the answer to something, you say: “______”
A.Sorry, I don’t understand.
B.I’m sorry. I don’t know.
C.Can I speak English?
D.Excuse me. How do you say that in English?
重载的运算符保持其原有的 、优先级和结合性不变。