This will be the reference level for reporting indication amplitude.
译成指示幅度就比较别扭了。
The chamber is first filled to a reference level and the volume recorded.
把水银装入容器中达到一个参考高度,记录此时的水银体积;
This is the most convenient reference level for most electrostatic problems.
对大多数的静电问题来说,这是最方便的参考点。
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