【多选题】与其他几种人工补偿器相比,球形补偿器除具有补偿能力大,流体阻力小的特点外。还包括《 ) 。
【判断题】争取创造一个友好、和谐的气氛,采用共鸣式开局往往是初次合作
【单选题】听力原文:W: John, it's 7:30. I wonder how much later they are going to be? M: Oh, you know Terry and Susan. They never arrive on time. W: Yes, but half an hour late! My dinner will be ruined. M: Oh, maybe...
【单选题】设随机变量X的概率密度函数为: Y表示对X的三次独立重复观察中事件{X<1 /2}出现的次数,则P(Y=2)=( )
【单选题】听力原文:W: Could I hand in my paper a few days later? M: I'm afraid that's out of the question. Q: What does the man mean? (19)
A.
The paper must be turned in on time.
B.
The question wasn't very clear.
C.
He should ask a different person.
D.
His request was made too late.
【多选题】与其他几种人工补偿器相比,球形补偿器除具有补偿能力大、流体阻力小的特点外,还包括( )。
【单选题】设E是关系代数表达式,F1、F2是选择条件表达式,则有( )。
A.
σ F1 (σ F2 (E))≡σ F1∨F2 (E)
B.
σ F1 (σ F2 (E))≡σ F1∧F2 (E)
C.
σ F1 (σ F2 (E))≡σ F1 (E)
【单选题】设E是关系代数表达式,F1、F2是选取条件表达式,则有( )。
A.
σF1(σF2(E)) = σF1νF2(E)
B.
σF1(σF2(E)) = σF1ΛF2(E)
【单选题】在规范法中,检验层厚度的确定与( )有关。
【单选题】听力原文:W: John, it's 7:30. I wonder how much later they are going to be? M: Oh, you know Terry and Susan. They never arrive on time. W.. Yes, but half an hour late ! My dinner will be mined. M: Oh, mayb...