currently
fast
readily
instantly
第1题:
22.1 used to love this film when I was young,but I _________ it that way any more.
A. don- t feel
B. didn- t feel
C. haven- t felt
D. hadn- t felt
第2题:
It’s not surprising that as a successful businessman, my friend Martin is not ____ he was when he graduated five years ago.
A. that
B. what
C. how
D. why
第3题:
With _w ______were you talking when I came in?
第4题:
A celestial body will cross the prime vertical circle when the latitude is numerically ______.
A.greater than the declination and both are of the same name
B.less than the declination and both are of the same name
C.greater than the declination and both are of contrary name
D.less than the declination and both are of contrary name
第5题:
第6题:
第7题:
5W2H法中5W和2H分别代表What、Where、When、W()、W()、H()、()。
第8题:
消费者购买行为的“5W1H”研究方法中,“5W”指的是()
第9题:
You issued the following RMAN command: RMAN> CONFIGURE CONTROLFILE AUTOBACKUP ON; What is NOT an impact of using the above command?()
第10题:
When a successful backup is recorded in the RMAN repository, then a backup of the current control file is performed.
When a structural change is made to the database, then a backup of the current control file is performed.
When a successful backup is performed in the RMAN repository, then a backup of the spfile is performed.
When a structural change is made to the database, then a backup of the alert log file will be performed.
第11题:
Greater than the declination and both are of the same name
Less than the declination and both are of the same name
Greater than the declination and both are of contrary name
Less than the declination and both are of contrary name
第12题:
book
story
play
film
第13题:
________our expectation, the experiment turned out to be a complete failure.
A: Contrary to
B: Contrary with
C: Contrary against
D: Contrary for
第14题:
When replacing a thermostatic expansion valve sensing bulb, it is necessary to
A.apply a light film of oil to increase heat transfer
B.apply a light film of oil to prevent oxidation
C.apply a heavy coating of grease to function as a heat sink
D.carefully coat the device with silicone sealant to reduce the effects of convective cooling
第15题:
材料:
Spark erosion is caused by a voltage discharge between the main bearing and journal surface. The cause of the potential is the development of a galvanic element between the ship’s hull, sea water, and the propeller shaft/crankshaft.
The oil film acts as a dielectric. The puncture voltage in the bearing depends on the thickness of the oil film. With increasing engine ratings, the specific load in the main bearing is increased. his will reduce the oil film thickness, and enable the discharge to take place at a lower voltage level.
Since the hydrodynamic oil film thickness varies through a rotation cycle, the discharge will take place at roughly the same instant during each rotation cycle, i.e. when the film thickness is at its minimum. The roughening will accordingly be concentrated in certain areas on the journal surface. In the early stages, the roughened areas can resemble pitting erosion. but later, as the roughness increases, the small craters will scrape off and pick up white metal-hence the silvery white appearance.
Therefore, to ensure protection against spark erosion, the potential level must be kept at maximum 80 mV, which is feasible today with a high efficiency earthing device. If an earthing device is installed, its effectiveness must be checked regularly. Spark erosion is only observed in main bearings and main bearing journals.
问题:
According to the paragraph one, a voltage between the main bearing and journal surface is produced by______.
A.propeller rotation
B.leakage from M/E electric control unit
C.a galvanic element
D.friction between the main bearing and journal surface
______engine ratings increase, the hydrodynamic oil film between the main bearing and journal surface is______.A.The lower/thinner
B.The higher/the thicker
C.The lower/thicker
D.The higher/thinner
When will the spark erosion take place on the journal surface during each rotation cycle?A.when the film thickness is at its minimum
B.when the film thickness is at its maximum
C.when the engine is on its compression stroke
D.when the engine is on its exhaust stroke
During the engine room watch keeping, which equipment must be noted to ensure protection against spark erosion?A.the antifouling plant
B.the earthing device
C.the main engine electric heating coils
D.the shaft generator
请帮忙给出每个问题的正确答案和分析,谢谢!
第16题:
第17题:
第18题:
Contrary to expectations, the film was successful()when it was released.
Acurrently
Bfast
Creadily
Dinstantly
第19题:
5W2H法中5W和2H分别代表:What、Where、When、()、()、()、()。
第20题:
When a valid SQL Query in a DB Read step returns 0 rows, which branch of the step will be executed? ()
第21题:
第22题:
第23题:
got to
had already started
ought to get
earlier