The -s switch specifies that only the synchronous (blocking) methods will be available.
s开关指定只有同步(块)方法可用。
Reverse blocking tetrode thyristor; semiconductor controlled switch.
反向阻断四极型可控硅、半导体控制开关。
A new type of hydraulic control switch with circular adjustment for blocking water in oil well is developed.
研制了一种新型液压控制可循环调层的堵水开关。
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