问题
单项选择题
当焦比一定时，利用系数随着（）。
A.冶强的降低而降低
B.冶强的降低而提高
C.冶强的变化而不变
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
当焦比一定时，利用系数随着（）。
A.冶强的降低而降低
B.冶强的降低而提高
C.冶强的变化而不变
参考答案：A
| 请你根据某学校的一个广播通知，填写下面的海报。 | |
| May I have your attention, please? I have an announcement to make. Since the A/H1Nl flu is around us, we should pay great attention to our health and get some knowledge about the terrible disease. Our school has invited Doctor Li to give us a talk about how to prevent (预防) the flu. It will start at 4:00 on Friday aftemoon in our school lecture hall. Students in Grade Seven are required to attend the talk. Please be there o n time. That's all. Thank you.
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