有关系表SC(S# , C#, Score),求“001”号课成绩比“002”号课成绩高的所有学生的学号。下列SQL语句正确的是_________。[br][/br](单选题) A: Select S1.S B: From SC S1, SC S2 Where S1.S C: = S2.S D: and S1.C E: =‘001’ and S2.C F: =‘002 ; G: Select S1.S H: From SC S1, SC S2 Where S1.S I: = S2.S J: and S1.C K: =‘001’ and S2.C L: =‘002’ and S1.Score > S2.Score; M: Select S1.S N: From SC S1, SC S2 Where S1.S O: = S2.S P: and S1.C Q: =‘001’ and S2.C R: =‘002’ and S2.Score > S1.Score; S: Select * From SC S1, SC S2 Where S1.S T: = S2.S U: and S1.C V: =‘001’ and S2.C W: =‘002’ and S1.Score > S2.Score;
有关系表SC(S# , C#, Score),求“001”号课成绩比“002”号课成绩高的所有学生的学号。下列SQL语句正确的是_________。[br][/br](单选题) A: Select S1.S B: From SC S1, SC S2 Where S1.S C: = S2.S D: and S1.C E: =‘001’ and S2.C F: =‘002 ; G: Select S1.S H: From SC S1, SC S2 Where S1.S I: = S2.S J: and S1.C K: =‘001’ and S2.C L: =‘002’ and S1.Score > S2.Score; M: Select S1.S N: From SC S1, SC S2 Where S1.S O: = S2.S P: and S1.C Q: =‘001’ and S2.C R: =‘002’ and S2.Score > S1.Score; S: Select * From SC S1, SC S2 Where S1.S T: = S2.S U: and S1.C V: =‘001’ and S2.C W: =‘002’ and S1.Score > S2.Score;
单位阶跃函数拉氏变换 A: 1/s B: 1 C: 1/s/s D: 1/s/s/s
单位阶跃函数拉氏变换 A: 1/s B: 1 C: 1/s/s D: 1/s/s/s
异步电动机处于电动机状态,发电机状态和电磁制动状态下的转差率s分别为()。 A: 0<s<1, s<0, s>1 B: −1<s<1, s<−1, s>1 C: 0<s<1, s>1, s<0 D: −1
异步电动机处于电动机状态,发电机状态和电磁制动状态下的转差率s分别为()。 A: 0<s<1, s<0, s>1 B: −1<s<1, s<−1, s>1 C: 0<s<1, s>1, s<0 D: −1
理想积分器和理想微分器的系统函数H(s)分别为_____。 A: s,1/s B: 1/s,1 C: 1/s,s D: 1,s
理想积分器和理想微分器的系统函数H(s)分别为_____。 A: s,1/s B: 1/s,1 C: 1/s,s D: 1,s
以下程序会报错的是( )。 A: s = ["a", "b", "c"] print(s[1]) B: s = ("a", "b", "c") print(s[1]) C: s = {"a", "b", "c"} print(s[1]) D: s = {0:"a", 1:"b", 2:"c"} print(s[1])
以下程序会报错的是( )。 A: s = ["a", "b", "c"] print(s[1]) B: s = ("a", "b", "c") print(s[1]) C: s = {"a", "b", "c"} print(s[1]) D: s = {0:"a", 1:"b", 2:"c"} print(s[1])
电子组态1s2p所构成的原子态为( )。 A: 1s2p1S0,1s2p1P1, 1s2p3S1 1s2p3P2,1,0 B: 1s2p1S0,1s2p1P1 C: 1s2p1S0,1s2p3S1 D: 1s2p1P1,1s2p3P2,1,0
电子组态1s2p所构成的原子态为( )。 A: 1s2p1S0,1s2p1P1, 1s2p3S1 1s2p3P2,1,0 B: 1s2p1S0,1s2p1P1 C: 1s2p1S0,1s2p3S1 D: 1s2p1P1,1s2p3P2,1,0
设有非空字符串s,则不能表示最后一个字符的表达式为( )。 A: s[-1] B: s[len(s)-1] C: s[-1:-2:-1] D: s[1]
设有非空字符串s,则不能表示最后一个字符的表达式为( )。 A: s[-1] B: s[len(s)-1] C: s[-1:-2:-1] D: s[1]
闸孔出流情况下,淹没系数σs的数值范围为( )。 A: σs<1 B: σs≤1 C: σs≥1 D: σs>1
闸孔出流情况下,淹没系数σs的数值范围为( )。 A: σs<1 B: σs≤1 C: σs≥1 D: σs>1
已知字符串s='tab',则以下值不为'bat'的表达式是: A: s[::-1] B: s[-1::-1] C: s[2::-1] D: s[0::-1]
已知字符串s='tab',则以下值不为'bat'的表达式是: A: s[::-1] B: s[-1::-1] C: s[2::-1] D: s[0::-1]
已知字符串s='12345',则以下值不为'54321'的表达式是: A: s[::-1] B: s[-1::-1] C: s[4::-1] D: s[0::-1]
已知字符串s='12345',则以下值不为'54321'的表达式是: A: s[::-1] B: s[-1::-1] C: s[4::-1] D: s[0::-1]