皮皮学，免费搜题
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【单选题】
人类增强就是利用生物医学技术、智能技术、神经科学技术、信息技术和纳米技术等高新技术手段使健康人类的机体功能或能力超出其正常范围，从而使人类的体貌、寿命、人格、认知和行为等能力发生根本性变化并具有全新能力的一种技术手段，其目的是显著提高人类生活的质量。根据上述定义，下列选项不属于人类增强的（）A.
演员赵某用药剂延缓衰老
B.
医生建议老张去做心脏搭桥手术
C.
医生将传感器植入老陈大脑提高其记忆力
D.
小王为了增加自己的身高服用类增高药物
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皮皮学刷刷变学霸
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
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