下列句子与旁通控制系统(IAB)有关。哪一句是正确的?()
A当发动机低转速运转时,仅开启较短的辅助通道
B当发动机低转速运转时,仅开启较长的主通道
C当发动机低转速运转时,同时开启主和辅助通道
D当发动机低转速运转时,同时关闭主和辅助通道
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