Frequent ______ is important: fixing or changing faulty parts of the propulsion system when necessary.
正确答案：maintenancemaintenance
举一反三
- ____ the unit if necessary. A: Assemble the unit.<br/>use new parts if necessary. B: Reassemble the unit.<br/>use new parts if necessary. C: Rebuild the unit.<br/>use new parts if necessary.
- When changing jobs, it is important to consider _____ salary and benefits. A: either B: yet C: both D: all
- When it came to fixing the car， the author___________________.
- Fill in blanks with the proper words given below, changing the form if necessary.
- Which of the following statements is correct? A: GUI of a target software system should be designed before its architecture. B: Whether design is necessary or not is up to each software organization. C: A good programmer can design a target software system while coding. D: Good design is important and necessary for the success of the target software system.
内容
- 0
What are the main restrictions on the maneuverability of the direct drive propulsion system when it is moving at a low speed?_____ A: Minimum stable speed of main engine B: Reduction gearbox speed C: Clutch performance D: Propeller size
- 1
The control process is a three-step process that includes unfreezing the system, changing the system, and refreezing the system.
- 2
The freight forwarder would prepare all necessary documents for exporter if necessary．
- 3
What are the main parts of submarine remote control vehicle?( ) A: Self propulsion B: Buoyancy control C: Ballast D: Pipeline
- 4
Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）