Britain is sliding down the world’s literacy league tables (it does better at maths, which thankfully remains ringfenced).
2
由于所使用的测试电流很低，所以就需要非常灵敏的电压表来测量这种通常在微伏范围的电压降。
Because of the low test current level used, a very sensitive voltmeter is required to measure the voltage drop, which is usually in the microvolt range.
3
与静电计相比，皮安表具有类似的低输入端压降，相同或稍快的测量速率，较低的电流灵敏度和低廉的价格。
When compared with an electrometer, a picoammeter has a similar low voltage burden, similar or faster speed, less sensitivity, and a lower price.
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