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【单选题】
下列关系中能构成函数的是（ ）。A.
｛＜ｘ，ｙ＞｜（ｘ，ｙ Ｎ） （ｘ＋ｙ＜１０）｝
B.
｛＜ｘ，ｙ＞｜（ｘ，ｙ Ｒ） （ｙ＝ｘ 2 ）｝
C.
｛＜ｘ，ｙ＞｜（ｘ，ｙ Ｒ） （ｙ 2 ＝ｘ）｝
D.
｛＜ｘ，ｙ＞｜（ｘ，ｙ Ｉ） （ｘ＝ｙ ｍｏｄ ３）｝
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反馈参考答案：
举一反三
【单选题】I feel very happy that I have won the prize.
A.
Good luck.
B.
Best wishes.
C.
Congratulations.
【多选题】如果实验台明显被传染性污染,可用下面哪种溶液喷洒遇污染物的表面?( )
A.
0.2%-0.5% 过氧乙酸
B.
0.1%-0.2 含氯消毒剂
C.
0.5% 的次氯酸钠
D.
80% 的酒精溶液
【简答题】Dear Dr Know, I’m not happy. I have too 1 rules in my family. I have to 2 at 6:00 every morning. I can’t 3 my friends after school 4 . I have to 5 my dog for a walk. I can’t watch TV on school nights....
【简答题】I have a neighbor we call “Happy”. I have never seen her angry at anything and never heard her say a harsh word to anyone or about anyone. Happy and her husband Ben, 70, have a huge garden. They spent...
【多选题】如果实验台明显被传染性污染,可用下面哪种溶液喷洒遇污染物的表面?( )
A.
0.2%-0.5% 过氧乙酸
B.
0.1%-0.2%含氯消毒剂
C.
5%的次氯酸钠
D.
80%的酒精溶液
【简答题】Dear
Dr. Know, I’m not
happy. I have too 1 rules in my family. I have to 2 at 6:00 every morning. I can’t 3 my friends after school 4 I
have to 5 my dog for a walk. I can’t watch TV on
school nights....
【简答题】After dinner I took a _around the park.
【简答题】Dear Dr. Know, I’m not happy. I have too 1 rules in my family. I have to 2 at 6:00 every morning. I can’t 3 my friends after school 4 I have to 5 my dog for a walk. I can’t watch TV on school nights. ...
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