For collections whose underlying store is not publicly available, the expected implementation is return current instance.

对于其基础存储区不可供公共使用的集合, 预期的实现是返回当前实例.

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Use a shielded cable with the high - level source circuit's return current carried in the shield ( Figure 18 ) .

负载电流较大时,用屏蔽体来充当负载电流 返回信号 源的通道.

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