Switchboards may be of the dead-front type in which all live parts are installed behind _____ and only the operation handles and instruments are on the front.
A.
the capstan
B.
the collector
C.
the panels
D.
the surface
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举一反三
【单选题】Ecotourism relies on
A.
government aid exclusively.
B.
local people and their donations of time and money.
C.
initial loans at the beginning, followed by support from tourists.
D.
government assistance through agencies and local disposable income.