问题
单项选择题 A1/A2型题
在气相色谱法中，可用作定量的参数是（）
A.保留时间
B.相对保留值
C.半峰宽
D.峰面积
E.进样量
答案
参考答案：D
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在气相色谱法中，可用作定量的参数是（）
A.保留时间
B.相对保留值
C.半峰宽
D.峰面积
E.进样量
参考答案：D
| 完形填空。 | |||
| There're different kinds of animals in the zoo. We see the zoo keepers give them 1 to eat. They don't have to 2 food by themselves. They just eat, walk and 3 all day. So many of 4 may think that the animals there 5 happy and lucky. But most 6 them are sad. Why? They're 7 free. Animals like elephants, monkeys and tigers 8 live freely and happily in 9 or mountains. Tigers, 10 example, run, jump, play with their children 11 catch small animals for food. But now they have to stay in 12 rooms in the zoo. Their life in the zoo is 13 different from their life in the forests. Now many of us think 14 animals should go back to forests and mountains so that 15 earth will become better. | |||
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