更多"A large valve，usually installed abo"的相关试题:
[单项选择]Valve cages are used on some large diesel engines to （）
A. reduce wear on the valve stem
B. permit the use of alloy valve seat materials
C. reduce heat transfer from the valve seat
D. facilitate valve removal for servicing
[单项选择]The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.
A. direct action of cam shaft
B. compressed air pressure
C. hydraulic “push rods”
D. direct action of the main piston moving down
[单项选择]Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）
A. closing later
B. opening sooner
C. staying open for a shorter period of time
D. staying open for a longer period of time
[单项选择]The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.
A. be jammed
B. be opened
C. be seated
D. be broken
[简答题]何谓随机存取存储器RAM？静态RAM和动态RAM的本质区别是什么？动态RAM为什么要刷新？
[填空题]动态RAM与静态RAM的主要不同点在于动态RAM需要（）。
[判断题]随机存取存储器RAM既可以是动态的RAM（DRAM），也可以是静态的RAM（SRAM）。
[简答题]动态RAM与静态RAM的主要不同点在于什么？
[简答题]静态RAM和动态RAM的存储元件分别是什么？动态RAM为什么需要刷新？进行刷新需要外部提供什么条件？
[判断题]CPU对内部RAM和外部RAM的读写速度一样快。
[单项选择]RAM属于（）
A. 内存储器
B. 外存储器
C. 辅助存储器
D. 只读存储器
[单项选择]A more sophisticated pressure reducing valve incorporates a pilot valve which controls the fluid above the valve operating piston in response to downstream pressureThe bold and italic word “which” means （）.
A. a pressure reducing valve
B. a pilot valve
C. an operating piston
D. downstream pressure
[单项选择]A thermostatic expansion valve is properly controlling evaporator superheatAdjusting this valve to lower the superheat will result in a/an （）.
A. evaporator pressure decrease
B. evaporator coil over-feed
C. evaporator capacity increase
D. expansion valve diaphragm rupture
[单项选择]Thermostatic expansion valve are （）.
A. either all the way open or all the way closed
B. normally open
C. throttled depending on load
D. controlled by suction pressure
[单项选择]Overflow valve is used to （）
A. control the fluid flow through it
B. prevent the pressure before it over the specified valve
C. make the pressure after it steady
D. control the direction of oil flow
[单项选择]During working, thermostatic expansion valve should be （）.
A. either all the way open or all the way closed
B. normally fully open
C. throttled depending on load
D. controlled by liquefied pressure
[判断题]单片机内部RAM和外部RAM是统一编址的，它们的访问指令相同。
[简答题]动态RAM为什么需要经常刷新？微机系统如何进行动态RAM的刷新？
