题目内容

Please choose the correct answer.

A. By bicycle.
By car.
C. By bus.
D. By subway.

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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

A. 重复性
B. 中间精密度
C. 准确度
D. 耐用性

分离度用于评价

A. 色谱柱的效能
B. 色谱柱的分离效能
C. 色谱峰的对称性
D. 方法的准确度

定量分析时要求色谱峰分离度至少应大于

A. 1.5
B. 1
C. 2
D. 3