更多"（）is a function of the reactive / r"的相关试题:
[单项选择]Which word indicates color variation in the characteristics of a light?（）
A. Opposing
B. Changing
C. Reversing
D. Alternating
[单项选择]Function过程的定义（）
A. 一定要有形参
B. 一定要有End Function语句
C. 一定要有As<类型>语句
D. 一定要指明它的存储类别
[名词解释]肥料效应函数 fertilizer response function
[单项选择]在Function过程体中退出Function过程的语句是（）。
A. Exit Do
B. Exit For
C. Exit Sub
D. Exit Function
[单项选择]What function is provided by the crankcase ventilation system on some diesel engines?（）
A. Increases the sludge forming tendency of lube oil
B. Prevents the accumulation of combustible gases
C. Improves lube oil cooling
D. Improves cold weather starting
[单项选择]One function provided by a hydraulic accumulator is to（）
A. provide an area where air can separate from the oil
B. provide an area to separate solid contaminants from the oil
C. act as an oil and water separator
D. absorb shocks occurring in the system
[单项选择]Diesel engine valve springs function to （）
A. hold the valves open
B. keep the valves off their seats until the exhaust stroke is completed
C. close the valves
D. open inlet valves when the air injection cycle begins
[单项选择]The basic function of the centrifugal pump impeller is to （）.
A. directly increase the pressure of the liquid being pumped
B. directly increase the velocity of the liquid being pumped
C. convert the potential energy of the liquid to kinetic energy
D. separate air from the liquid being pumped
[单项选择]What is the function of the command switchport trunk native vlan 999 on a？（）
A. It designates VLAN 999 for untagged traffic.
B. It blocks VLAN 999 traffic from passing on the trunk.
C. It createsa VLAN 999 interface.
D. It designates VLAN 999 as the default for all unkown tagged traffic.
[单项选择]The function of a centrifugal pump double volute casing is to （）.
A. reduce radial thrust to the impeller
B. double the liquid velocity through the pump when compared to a single volute
C. reduce hydraulic end thrust
D. provide the effect of multi-staging
[单项选择]Generally the function of lubrication is to form of a film of lubricant between any two surfaces that have relative （）, so that surfaces dont get touch with each other.
A. gravity
B. motion
C. ratio
D. density
[单项选择]The main function of tie rods in the construction of large, low speed diesel engines is to（）.
A. stiffen the bedplate in way of the main bearings to increase the engines longitudinal strength
B. accept most of the tensile loading that results from the firing forces developed during operation
C. mount the engine frame securely to the hull to prevent shaft coupling misalignment
D. connect the crosshead solidly to the piston rod
[单项选择]The function of lubricating oil is to （）
A. maintain even distribution of bearing wear
B. maintain a constant oil temperature
C. maintain a pressurized film between moving surfaces
D. remove entrained water
[单项选择]A signal derived from a controlled function and returned to the initiating point is called a/an （）.
A. monitoring signal
B. inverse signal
C. reverse signal
D. feedback signal
[单项选择]The main function of the lubrication system in to enable （） of a film of oil between the moving parts.
A. the information
B. the formation
C. the scatter
D. the friction
[单项选择]The monitoring function may serve all of the following purposes except（）
A. instigating corrective action
B. indicating values of controlled variables
C. warning of off-limit conditions
D. providing record of performance
[单项选择]Which is a function of the voltage regulators used with AC generators?（）
A. To cut out generators when they are no longer required
B. To cut in additional generators automatically as required
C. To divide the KW load equally between generators operating in parallel
D. To divide reactive current between generators operating in parallel
[单项选择]The main function of piston compression rings is to （）
A. prevent excessive cylinder liner wear
B. reduce friction losses in the engine
C. seal the space between the piston and the liner
D. limit upward flow of lube oil into the combustion space
[单项选择]The function of damper windings in a synchronous motor is to （）.
A. eliminate slippage
B. provide excitation
C. provide starting torque
D. increase efficiency
