Whichoneisright?
A: LucyisnotChinese.SheisAmerican.
B: LiLei’sfatherisateacherofEnglish.
C: MaryGreenisanEnglishteacher.
D: MrBlackisaChineseteacher.
A: LucyisnotChinese.SheisAmerican.
B: LiLei’sfatherisateacherofEnglish.
C: MaryGreenisanEnglishteacher.
D: MrBlackisaChineseteacher.
举一反三
- Whichoneisright? A: No1 B: No2
- 下列选项中,能够一次性向student表中添加三条记录的SQL语句是 A: INSERT INTO student VALUES (6,'lilei',99);(7,'hanmeimei',100);(8,'poly',40.5); B: INSERT INTO student VALUES (6,'lilei',99) (7,'hanmeimei',100) (8,'poly',40.5); C: INSERT INTO student VALUES (6,'lilei',99),(7,'hanmeimei',100),(8,'poly',40.5); D: INSERT INTO student VALUES (6,'lilei',99) VALUES(7,'hanmeimei',100) VALUES(8,'poly',40.5);
- Lilei arrived at the railway station at 4 o'clock in the afternoon.It was 4 o'clock in the afternoon ___ Lilei arrived at the railway station.There were more people on the train than he expected.He ___ expect that there were so many people on the train.He didn't find any empty seats on the train.He found ___ empty seats on the train.
- 20A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、120、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、130、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、A、B、C、D、140、A、B、C、D、A
- 以下集合A={a,b,c,d}上关系，其中（ ）是等价关系。 A: {(a,a),(a,d),(b,b),(b,c),(c,b),(c,c),(d,a) } B: {(a,a),(a,b),(b,a),(b,b),(c,c),(c,d),(d,c),(d,d)} C: {(a,a),(b,b),(b,c),(c,b),(c,c),(d,a),(d,d)} D: {(a,a),(a,b),(b,a),(b,b),(b,c),(c,b),(c,c),(d,d)}