更多"Critical speeds occurring within th"的相关试题:
[单项选择]The certificate of inspection of a vessel will specify the （）.
A. number of licensed personnel required on board
B. maximum load line draft
C. maximum water depth for drilling
D. next date for an inclining experiment
[单项选择]Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent （）.
A. excessive crankcase pressure
B. excessive lube oil temperature
C. contamination of the lube oil by water
D. contamination of the cooling water by lube oil
[单项选择]Operating a rotary pump at speeds in excess of design requirements could cause（）.
A. decreased clearances between rotating parts
B. decreased slippage to the suction side of the pump
C. air binding in the discharge ports
D. erosion and excessive wear
[单项选择]SPE（国际石油工程师协会）成立于哪一年？（）
A. 1970年
B. 1977年
C. 1980年
D. 1987年
[单项选择]The most critical part of the bunkering operations, which can result in an oil spill, is when the （）
A. hose joints are made up
B. tanks are being topped off
C. system is being lined up
D. pumping operation is first started
[单项选择]Critical speed in diesel engines occurs when engine torque pulsations become （）
A. opposed to the crankshaft rocking couple
B. resonant with the crankshaft natural frequency
C. critical fore and aft crankshaft vibrations
D. horizontal whipping motions of the crankshaft
[单项选择]What speeds must be disabled in a mixed 802.11b/g WLAN to allow only 802.11g clients to connect?（）
A. 6，9，12，18
B. 1，2，5.5，6
C. 5.5，6，9，11
D. 1，2，5.5，11
[简答题]临界区（互斥区）：critical section
[单项选择]When is the most critical time of bunkering in regards to oil pollution?（）
A. lining up the systems
B. topping off
C. starting delivery
D. connecting hoses and joints
[判断题]如果一个BGP Speaker在open报文中有GR能力字段，但其中没有任何，说明这个BGP Speaker没有备份转发表，所以只能作为GR Restarter。
[单项选择]美国的关键信息基础设施（critical Information Infrastructure，CII）包括商用核设施、政府设施、交通系统、饮用水和废水处理系统、公共健康和医疗、能源、银行和金融、国防工业基地等等，美国政府强调重点保障这些基础设施信息安全，其主要原因不包括（）
A. 这些行业都关系到国计民生，对经济运行和国家安全影响深远
B. 这些行业都是信息化应用广泛的领域
C. 这些行业信息系统普遍存在安全隐患，而且信息安全专业人才缺乏的现象比其他行业更突出
D. 这些行业发生信息安全事件，会造成广泛而严重的损失
[单项选择]The word “critical” in the sentence “This is a critical period as any loss of propulsion, or steering, can lead to collision, grounding, or other damage to the ship” can be best replaced by （）.
A. dangerous
B. best
C. bad
D. important
[单项选择]The sudden reduction of pressure occurring within the crankcase of a refrigeration compressor during starting causes the （）.
A. sudden evaporation of wax crystals in the lubricant
B. sudden evaporation of entrapped air in the lubricant
C. release of refrigerant from the oil/refrigerant mixture
D. release of dissolved lubricant from the refrigerant
[单项选择]To maintain the down stream pressure within defined limits over a range of flow and despite any changes in supply pressure, （） is fitted.
A. a check valve
B. a gate valve
C. a pressure reducing valve
D. a quick closing valve
[单项选择]Ships changing their location within the port limits are also required to report their new （）.
A. bearings
B. distances
C. sections
D. positions
[单项选择]Since the burning or combustion takes place within the engine itself, the engine is known as （）.
A. a fire -tube boiler
B. an internal combustion engine
C. an external combustion engine
D. an internal combustion generator
[单项选择]Forces within a drilling unit have caused a difference between the starboard and port drafts. This difference is（）.
A. list
B. heel
C. trim
D. flotation
[单项选择]Forces within a vessel have caused a difference between the starboard and port drafts,This difference is called（）.
A. lists
B. heel
C. trim
D. flotation
