海船船员考试
单选题Because of the reduced （） in the vacuum boiling evaporator, some of the sea water boils as it flows through the tubes.A temperatureB water levelC pressureD rate of flow
题目
temperature
water level
pressure
rate of flow
相似问题和答案
第1题：
Obtaining Drinking Water from Air Humidity
Not a plant to be seen,the desert ground is too dry.But the air contains water,and research scientists
have found a. __________
(51)of obtaining drinking water from air humidity."The process we have
developed is based exclusively on renewable energy sources_________(52)thermal solar collectors and
photovoltaic（光电的）cells , ________( 53 ) makes this method completely energy-autonomous. It will
____________( 54 ) function in regions where there is no electrical infrastructure（基础设施）,"says Siegfried
Egner,head of the research team. The principle of the_________(55)is as follows:hygroscopic（吸湿的）
brine（盐水）一saline（含盐的）solution which absorbs moisture一runs down a tower-shaped unit and absorbs
water from the air. It is then sucked__________(56)a tank a few meters off the ground in which a vacuum
prevails.Energy from solar collectors_________(57)up the brine,which is diluted by the water it has
__________ (58).
Because of the vacuum,the boiling point of the liquid is lower than it would be under__________(59)
atmospheric pressure. The evaporated (蒸发的）, non-saline water is condensed and runs down through a
completely filled tube in a controlled manner. The gravity of this water column_______(60)produces the
vacuum and so a vacuum pump is not needed.The reconcentrated brine________(61)down the tower
surface again to absorb moisture from the air.
"The concept is suitable for various water________(62).Single一person units and plants
supplying water to entire hotels are conceivable,"says Egner. Prototypes have been built for_______
(63)system components一air moisture absorption and vacuum evaporation一and the research scientists
have already __________(64)their interplay on a laboratory scale.In a further ________(65)the re-
searchers intend to develop a demonstration facility.
A:in spite of
B:because of
C:as a result of
D:such as
such as表示“比如”，用于列举。
此处为非限制性定词从句，所以用which。
根据上文“这使得该方法在能量方面完全自主”可知，这里指“即使在没有电力基础设 施的地方仍可起到作用”，所以选D。
根据上下文可知“这套工序的原理如下”，所以选B。
suck into表示“吸入”。
根据上下文可知这里指“来自太阳能收集器的能量将盐水加热”。
absorb表示“吸收”，这里指稀释所吸收的水。
normal“正常的”，这里指“在真空环境中，液体的沸点要比在正常大气压下低。”
continuously“不间断地”;suddenly“突然地”;typically“典型地”;senously“严重地”。根据上下文可知，这里指“水柱的重力持续制造真空状态，所以不需要真空泵”。
run原意为“跑”，但这里是“流动”的意思，run down“沿着······流动”。根据上下文可知“二次浓缩的盐水会沿着塔状物再次向下流去吸收空气中的水”，所以选D。
根据上下文可知“这一理念适用于各种各样的水的使用者”，所以选A。
both"（两者）都”；因为这里是强调空气水汽吸收器和真空蒸汽机两个机器之间的作用 效果，所以选A。
这里指“科研人员已经在实验室里测试了它们相互作用的效果”，所以选C。
step“步骤”;instrument“工具”;case“案例”;ground“地面”。根据上下文可知“在下一步 的研究中，研究者会开发出一套用于展示的设备”，所以选B。
第2题：
poor distillate quality
reduced evaporator capacity
low brine concentration
improper vacuum regulation
第3题：
Which of the following problems can occur if you continually fail to drain off condensate from a starting air receiver?
A.Corrosion and eventual failure of the tank
B.Gumming of the tank relief valves
C.Immediate failure of components downstream of the compressed air system
D.Boiling of the water oil mixture as pressure is reduced
第4题：
Sea water is heated to boiling temperature under a vacuum
Sea water is passed over heated plates in a thin film
Heated sea water is injected into a vacuum chamber
Sea water is forced through a heated eductor
第5题：
pressure
temperature
density
volume
第6题：
Which of the following is an advantage of using virtualization to consolidate servers？（）
- A、Reduced power and space requirements
- B、Saves money on software costs
- C、Maintenance is easier because there is only one server
- D、Fewer instances of the operating system to maintain
正确答案:A
第7题：
a separate air ejector unit
a direct unimpeded connection between second stage and salt water feed heater
either by vacuum drag or an external line from the first stage via a fixed orifice
the fixed orifice provided in the steam supply line
第8题：
An upright vessel has negative GM．GM becomes positive at the angle of loll because the ______．
A.Free surface effects are reduced due to pocketing
B.KG is reduced as the vessel seeks the angle of loll
C.Effective beam is increased causing BM to increase
D.Underwater volume of the hull is increased
第9题：
to decrease scale formation
for better cooling effect
for more economical purpose
to raise vacuum
第10题：
in the middle of evaporator coils
near the evaporator coil outlet
near the evaporator coil inlet
on the bottom row of evaporator coils