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【多选题】
以下关于液控单向阀说法正确的是()A.
液控单向阀是支架执行元件的主要组成部分之一
B.
液控单向阀能闭锁立柱或千斤顶工作腔的液体，使之保持一定的压力
C.
液控单向阀主要由单向阀芯和液控顶杆两部分组成
D.
液控单向阀质量的好坏能直接影响支架动作的可靠性
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举一反三
【单选题】Consider a linear system whose augmented matrix is of the form which of the following statements hold such that the system will have infinitely many solutions?
A.
a=0,b=0
B.
a=0,b≠0
C.
a≠0,b=0
D.
a≠0,b≠0
【单选题】Consider a linear system whose augmented matrix is of the form which of the following statements hold such that the system must be inconsistent?
A.
a=0,b=0
B.
a=0,b≠0
C.
a≠0,b=0
D.
a≠0,b≠0
【多选题】Consider a linear system whose augmented matrix is of the form ,which of the following statements hold such that the system must have the unique solution?
A.
a=5, b≠4
B.
a=5, b=4
C.
a≠5, b≠4
D.
a≠5, b=4
【单选题】Consider a linear system whose augmented matrix is of the form which of the following statements hold such that the system must be inconsistent?
A.
a=0,b=0
B.
a≠0,b=0
C.
a=0,b≠0
D.
a≠0,b≠0
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