在锅炉_________系统中可能设有盐度计。

【名词&注释】

控制阀(control valve)、截止阀(stop valve)、垂直距离(vertical dimension)、分泌物(secretion)、尿道口(urethral orifice)、粘液性(mucinous)、空气分配器(air distributor)、吃水线(water line)、硬纸板(carton)

[单选题]在锅炉_________系统中可能设有盐度计。

A. 蒸汽
B. 凝水
C. 给水
D. 排污

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学习资料：

[单选题]舱内装散装粮食，又未进行通风而发生火灾属于()

A. 燃烧
B. 受热自燃
C. 自热自燃

[单选题]柴油机启动系统中主启动阀位于( )。

A. 空气瓶与启动控制阀之间
B. 截止阀与空气瓶之间
C. 空气分配器^{(air distributor)}与气缸启动阀之间
D. 启动控制阀与空气分配器^{(air distributor)}之间

[单选题]船舶由深水进入浅水区，发生的现象，下述( )正确。

A. 船速下降，航向稳定性提高
B. 船速下降，航向稳定性下降
C. 船速提高，航向稳定性提高
D. 船速提高，航向稳定性下降

[单选题]可作骨折代夹板的物品有( )

A. 绷带
B. 木板，硬纸板^(carton)
C. 衣物
D. 以上均可

[单选题]所有梯道、走廊和起居处所内脱险通道要求的感烟探测器应在烟密度超过______每米减光率之前动作。但在烟密度超过_____每米减光率之前不应动作。

A. 10.5％/2％
B. 11.5％/2％
C. 12.5％/2％
D. 13.5％/3％

[单选题]第三组：The sewage treatment system must be capable of discharging an effluent that comes within the limits of the tests. Sewage can be treated biologically so that it may be discharged with minimal damage to ecosystem. Biological treatment involves the use of living organisms to treat the sewage within the sewage treatment plant so the liquids and sludge discharged are within the standards specified.

A. Biological treatment plants are usually built up as a module and consist of various sections.
B. Waste matter collected from the ships sanitary appliances is led through a sanitary piping system to the treatment module. The solid matter is broken up by passing it through a screen or a series of revolving cutters. The broken up solid material, together with the waste liquid, passes into a tank containing bacteria which require oxygen and a nutrient to propagate. The nutrient is contained in the solid waste material, and oxygen is supplied by bubbling compressed air through the broken up waste. The propagated bacteria change the waste material into a sludge by aerobic digestion. The sludge is finally treated to kill the coliform. bacteria before it is passed overboard.
C. When a biological sewage plant is started up, such as when activating a new ship or after cleaning out the tank, a pellet containing bacteria is introduced into the tank. It takes approximately one week for the bacteria to propagate and make the system fully effective. The choice of sanitary appliance cleaners requires extreme care, as many cleaners are toxic to the active bacteria. Once a biological sewage plant is made active it should not be shut down. If it is it will have to be reactivated again because the bacteria will die without a supply of nutrients and oxygen.
D. Bacteria that require oxygen for their survival are referred to as aerobic. Aerobic bacteria are normally used in ships&39; sewage treatment equipment. Other forms of bacteria that do not require oxygen are referred to as anaerobic. Anaerobic bacteria are used in shore based sewage treatment works where methane is obtained as a by-product for use as fuel.
E. This passage is mainly about
F. sewage treatment methods
G. the various sections of a sewage treatment plants
H. biological sewage treatment system
I. how the sewage treatment plants are started up

[单选题]Which information is not given in the text?

A. Ship recycling contributes to sustainable development
B. The IMO believes that making an international instrument to regulate the ship recycling process is urgently in need
C. An international convention on ship recycling has been adopted
D. The IMO has taken action to develop an effective solution to the problem of ship recycling

[单选题]男性淋病患者尿道口表现为红肿并可见有______分泌物溢出。

A. 粘液性
B. 桨液性
C. 脓性
D. 血性

[单选题]在船舯处，由吃水线^{(water line)}量至干舷甲板上缘的垂直距离称：()

A. 吃水
B. 干舷
C. 型深
D. 型宽

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