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最多能拥有一条FCH,两条前向SCH(F-SCH)两条反向SCH(R-SCH); 最多能拥有一条FCH,一条前向SCH(F-SCH)两条反向SCH(R-SCH); 最多能拥有一条FCH,一条前向SCH(F-SCH)一条反向SCH(R-SCH); 最多能拥有一条FCH,两条前向SCH(F-SCH)一条反向SCH(R-SCH)。
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