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12. GWD26-Q12 The most vexing problem faced by researchers exploring wind-powered generation of electricity is achieving a constant flow of power from an unpredictable natural source that meets demand, but so the flow does not overload electrical grids with sudden voltage increases
A. achieving a constant flow of power from an unpredictable natural source that meets demand, but so the flow does not overload B. achieving a constant flow of power from an unpredictable natural source, which meets demand but without overloading C. how to achieve a constant flow of power from an unpredictable natural source, a flow that meets demand but does not overload D. how to achieve a constant flow of power from an unpredictable natural source, but a flow that meets demand without overloading E. how a constant flow of power from an unpredictable natural source can be achieved, which meets demand but does not overload 答案是C, A哪里错了? |
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