... 任选数字叙述号码 optional numeric statement number 任选作业 optional operation 任选运算子 optional operator ...
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Removes all of the elements from this list (optional operation).
从列表中删除所有元素(可选操作)。
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PLC or Relay control with optional operation of manual and semi-auto.
有电脑、继电器两种控制方式，设有手动、半自动两种操作方式。
Ensures that this collection contains the specified element (optional operation).
确保集合包含指定元素(可选操作)。
With optional battery power operation (requires six AA batteries, not included), users can even take the IS9181 out of their home or office to the patio or backyard, as long as the Wi-Fi signal is in range for streaming.
ENGADGET: VTech plunges into home audio market with IS9181 WiFi radio
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