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【判断题】
在河弯处,一般凹岸接受侵蚀,凸岸接受堆积,从而使河流越来越弯曲()。 A. 对 B. 错 C. 不确定 D. 南北半球正好相反A.
正确
B.
错误
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举一反三
【判断题】Like the gate valves, a ball valve lifts the flow-control device out of the process stream.
A.
正确
B.
错误
【单选题】Which of the following valves is not belonging to the pressure valves?
A.
relief valve
B.
reducing valves
C.
sequence valves
D.
restrictors
【单选题】In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low alloy steels because _____.
A.
the beveled edges of the intake valves provide for serf-centering during seating
B.
intake valves utilize stellite-coated valve seat inserts which reduce wear
C.
the volume of air passing through intake valves is less than the volume of air passing through exhaust valves
D.
intake valves are less affected to the corrosive action of exhaust gases
【判断题】When compared to gate valves, globe valves have a much greater pressure drop across the valve.
A.
正确
B.
错误
【判断题】A block valves is any valve that is intended to block flow; also called an isolation valve. The term generally refers to gate valves
A.
正确
B.
错误
【单选题】Gibson Valves produces cast bronze valves on an assembly line. If 1600 valves are produced in an 8-hour shift, the productivity of the line is
A.
2 valves/hr
B.
40 valves/hr
C.
80 valves/hr
D.
200 valves/hr
E.
1600 valves/hr
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