General, the best way for replacement of lamp is （）.<br>A:after the point is reached at which the failures begin to increase rapidly<br>B:before the point is reached at which the failures begin to increase rapidly<br>C:before the point is reached at which the failures begin to increase slowly<br>D:after the point is reached at which the failures begin to increase slowly

General, the best way for replacement of lamp is （）.
A:after the point is reached at which the failures begin to increase rapidly
B:before the point is reached at which the failures begin to increase rapidly
C:before the point is reached at which the failures begin to increase slowly
D:after the point is reached at which the failures begin to increase slowly

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