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请解释：a portfolio worker

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请解释：total quality management

The hydraulic system may be affected by ________ problems or outside damage such as bird-strike.

A. technical
B. safety
C. medical
D. organic

There are some reasons that may ______ wheel well fire such as overheated brakes.

A. contribute to
B. attribute to
C. devote to
D. adhere to

The pressure regulator unloads or ______ the engine driven pump when the desired pressure in the system is reached.

A. believes
B. relieves
C. retrieves
D. receives