问题
单项选择题
当背景气中含有干扰组分时，可采用预除法、（）来削弱其影响。
A、吸收法
B、降温法
C、加压法
D、补偿法
答案
参考答案：D
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当背景气中含有干扰组分时，可采用预除法、（）来削弱其影响。
A、吸收法
B、降温法
C、加压法
D、补偿法
参考答案：D
| 阅读理解。 | ||
| ||
| 1. Tim is unhappy because _____. | ||
| A. he has to work at 5 a.m. B. he has many rules C. he can't study at home D. he can't sleep well | ||
| 2. Tim can hang out with friends _____. | ||
| A. after school B. in the evenings C. on weekends D. in summer vacations | ||
| 3. Dr. Know tells Tim that _____. | ||
| A. he needn't obey the rules B. he has less rules at home C. school rules are more important D. parents make rules to help him |