更多"These plants are rather difficult（）"的相关试题:
[单项选择]Most marine biological sewage treatment plants consist of all the following statements except （）.
A. aeration tanks
B. settling tanks
C. disinfection agent
D. anaerobic bacteria
[单项选择]A number of biological sewage treatment plants are in use at sea but nearly all work on what is called the extended aeration processBasically the consists of oxygenating the liquor by bubbling air through itAccording to the above two sentences, the word "this" means （）.
A. a sewage treatment plant
B. the extended aeration process
C. the liquor
D. the bubbling air
[单项选择]A number of biological sewage treatments plants are in use at sea but nearly all work on the principle called （）
A. deoxygenating
B. extended aeration
C. oxygenating
D. bubbling air
[单项选择]Typical marine propulsion plants include（） directly coupled to the vessel’s single large-diameter, fixed-pitch propeller.
A. a single, long-stroke, slow-speed, turbocharged, two-stroke diesel engine
B. a single, long-stroke, medium-speed, turbocharged, four-stroke diesel engine
C. two medium-speed, turbocharged, four-stroke diesel engines
D. a variable-speed AC generator
[单项选择]Very few plants will（）without water.
A. flourish
B. fade
C. stem
D. cultivate
[单项选择]Fertilizer will（）the growth of these tomato plants.
A. accomplish
B. accelerate
C. accumulate
D. account
[单项选择]Cargo on deck，plants and live animals are usually received，handled，carried，kept and discharged at（）.
A. Carrier’s risk
B. Owner’s risk
C. Merchant's risk
D. Charterer’s risk
[单项选择]Why shiprepair is an inherently difficult business to manage in the conventional sense?（）
A. Because it is difficult to plan and manage
B. Because it is cannot be well categorized
C. Because it is a difficult work for people to undergo
D. Because it is seldom researched by research
[单项选择]Wristpin bearings are difficult to lubricate because of their oscillating motion and（）
A. their free-floating design
B. their relatively small size
C. the reciprocating motion of the piston
D. their position in the lubrication system
[单项选择]There（）three plants in the corners of the room.
A. is
B. are
C. have
[单项选择]What natural feature is responsible for the rather even climate found on the Florida peninsula throughout the year? （）
A. Strong masses of continental air
B. The Gulf Stream
C. The Bermuda high
D. The cool waters of the Sargasso sea
[单项选择]The question was so difficult that （） people could answer it.
A. little
B. afew
C. few
[单项选择]It is difficult to determine which limb of the Moon is fully illuminated（）.
A. when the Moon is low in the sky at rising or setting
B. at the new Moon phase
C. when taking Moon sights during daylight
D. when the terminator is nearly vertical
[单项选择]If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.
A. compression pressures are below normal
B. lube oil is diluted with fuel oil
C. cranking speed is too low
D. exhaust system is partially restricted
[单项选择]I'd like to know what you（）the plants I gave you.
A. made for
B. dealt with
C. live on
D. did with
[单项选择]（）moving rather quickly east expected 150 miles south of Cape Farewell 972 by 160000 GMT.
A. Developed low
B. Developing low
C. Being developed low
D. Low to be developed
[单项选择]What do you find difficult in learning English?（）
A. Listening and speaking.
B. Don‘t be afraid of difficulties.
C. Learning English is useful.
D. Don‘t be disappointed.
[单项选择]（）students often find it difficult to live in China at first.
A. Outside
B. Overseas
C. National
D. Abroad
