She has been working in this factory ______. A: after 1968 B: in 1968 C: since 1968 D: for 1968
She has been working in this factory ______. A: after 1968 B: in 1968 C: since 1968 D: for 1968
11.She went to the countryside ______. a. in the morning at nine on June first,1968 b. on June first,1968 in the morning at nine c. at nine in the morning on June first,1968 d. on June first,1968 at nine in the morning A: in the morning at nine on June first,1968 B: on June first,1968 in the morning at nine C: at nine in the morning on June first,1968 D: on June first,1968 at nine in the morning
11.She went to the countryside ______. a. in the morning at nine on June first,1968 b. on June first,1968 in the morning at nine c. at nine in the morning on June first,1968 d. on June first,1968 at nine in the morning A: in the morning at nine on June first,1968 B: on June first,1968 in the morning at nine C: at nine in the morning on June first,1968 D: on June first,1968 at nine in the morning
给定关系 R(A,B,C,D)和关系 S(A,C,D,E,F),对其进行自然连接运算 R∞S 后的属性列为()个;与σR.C>S.F(R∞S)等价的关系代数表达式为(请作答此空) A: σ3>9(RxS) B: π1,2,3,4,8,9(σ1=5∧3=6∧4=7∧3>9(R×S)) C: σ'3'>'9'(R×S) D: 1,2,3,4,8,9(σ1=5∧3=6∧4=7∧'3'>'9'(R×S))
给定关系 R(A,B,C,D)和关系 S(A,C,D,E,F),对其进行自然连接运算 R∞S 后的属性列为()个;与σR.C>S.F(R∞S)等价的关系代数表达式为(请作答此空) A: σ3>9(RxS) B: π1,2,3,4,8,9(σ1=5∧3=6∧4=7∧3>9(R×S)) C: σ'3'>'9'(R×S) D: 1,2,3,4,8,9(σ1=5∧3=6∧4=7∧'3'>'9'(R×S))
1968
1968
某R进制数(627)R=511,则R=() A: 8 B: 9 C: 12 D: 16
某R进制数(627)R=511,则R=() A: 8 B: 9 C: 12 D: 16
在下列字符中,其ASCII码值最大的一个是 A: 9 B: e C: R
在下列字符中,其ASCII码值最大的一个是 A: 9 B: e C: R
汉语字母9【r】是平舌音还是翘舌音?
汉语字母9【r】是平舌音还是翘舌音?
在下列字符中,其ASCII码值最大的一个是 A: 9 B: e C: R D: <
在下列字符中,其ASCII码值最大的一个是 A: 9 B: e C: R D: <
电路如图所示,当R=4Ω时,I=2A。求当R=9Ω时,I等A.(3.0分)
电路如图所示,当R=4Ω时,I=2A。求当R=9Ω时,I等A.(3.0分)
()年,()首先试飞了超声速旅客机图144. A: 1965;美国 B: 1968;美国 C: 1965苏联 D: 1968
()年,()首先试飞了超声速旅客机图144. A: 1965;美国 B: 1968;美国 C: 1965苏联 D: 1968