单项选择题

George Annas would probably agree that doctors should be punished if they ________.

A．manage their patients incompetently.
B．give patients more medicine than needed.
C．reduce drug dosages for their patients.
D．prolong the needless suffering of the patients.
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单项选择题
It can be inferred from the passage that, in the course of a heating season, the heating capacity of a heat pump is greatest when ________.
A．heating is least essential
B．electricity rates are lowest
C．its compressor runs the fastest
D．outdoor temperatures hold steady'
单项选择题
According to the passage, the role of the flow restriction in a heat pump is to ________.
A．measure accurately the flow rate o{ the refrigerant mass at that point
B．compress and heat the refrigerant vapor
C．bring about the evaporation and cooling of refrigerant
D．exchange heat between the refrigerant and the air at that point
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