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When I need gas for my car, I pull into a gas station right around the corner from my house and use my gas card. Years ago, full-service gas stations were very 20 . However, things have changed. Now, most gas stations are self-service centers. Personally, I 21 fill the car up with gas every time I stop. I generally22, but more and more gas stations accept credit cards. As gas prices are 23 , I’m now thinking about buying a more fuel-efficient vehicle or just 24to work.
在较短时间内，在相同条件下，由同一分析人员连续测定所得结果的RSD称为
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