这些放大器是用微型电子管制成的。
These amplifiers have long been made with tiny election tubes.
这些放大器是用微型电子管制成的。
These amplifiers have long been made with tiny election tubes .
有了这些放大器分离型传感器，从上午光…
With these Separate-amplifier Sensors, the light from the Am…
有了这些放大器分离型传感器，从上午光…
With these Separate-amplifier Sensors, the light from the Am…
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