皮皮学，免费搜题
登录
搜题
【多选题】
以下有关认定层次计划的重要性与实际执行的重要性相关的说法中，错误的有（ ）。A.
认定层次的重要性主要是参照财务报表实际执行的重要性确定的
B.
认定层次实际执行的重要性应按本认定层次计划的重要性来确定
C.
认定层次实际执行的重要性应按财务报表实际执行的重要性确定
D.
认定层次的重要性水平直接影响本认定的进一步审计程序的范围
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】What is the function of wearing rings found on some centrifugal pumps ________．
A.
Absorb erosion of high velocity discharge stream
B.
Seal pump shaft against entry of air
C.
Isolate the outlet side from the inlet side
D.
Dampen the turbulent discharge flow
【判断题】Dynamic pumps are classified as centrifugal or axial. axial pumps operate on the principle of centrifugal force.
A.
正确
B.
错误
【单选题】Centrifugal pumps can be designed with a number of impellers _____ to attain a high final delivery pressure.
A.
in series
B.
in parallel
C.
either A or B
D.
None of the above is tree
【单选题】Which of the following pumps belongs to centrifugal pump?
A.
Piston pump
B.
Screw pump
C.
Diffuser pump
D.
Water-ring pump
【简答题】桥式可逆斩波电路用于拖动直流电动机时,可使电动机工作于第 象限。
【单选题】Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be _____.
A.
one size smaller than the pump suction nozzle
B.
the same size as the pump suction nozzle
C.
one size larger than the pump suction nozzle
D.
installed with a short radius elbow at the pump
【单选题】Which of the listed statements is correct concerning the starting of centrifugal pumps? .
A.
They should always be started with the discharge valve closed
B.
They should always be started with the discharge valve opened
C.
A priming pump is always required to flood the impeller suction
D.
They should always be started with the sealing line valves closed
相关题目：
参考解析：
知识点：
题目纠错 0
发布
