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1 . 已知在一次降雨过程中,某地降雨量y(单位:
)与时间t(单位:
)的函数关系可近似表示为
,则在
时的瞬时降雨强度(某一时刻降雨量的瞬间变化率)为______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f3bf70722b22983c120d008d097602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76ce48eafd36547782174eb304d4a003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5bd521773233a447d8c7f9b269a5d6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c90b88feae919ff5ac22a10809d5fee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7387d73cfade5ea058c5bb5e337c1a9.png)
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2 . 函数
在
处的瞬时变化率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7186a0a143460905e117dd9dc17c45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 如图,酒杯的形状为倒立的圆锥.杯深
,上口宽
,水以
的流量倒入杯中,则当水深为
时,时刻![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
________
,水升高的瞬时变化率![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4ef973817d347fc468c0a1f776d798.png)
_________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af62da2f87dfc02c63e7a1c0949f09d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ba48323cd79d207715e82d1e5a7d5e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a270281ea2f121b3657317a77c09f939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/244ea6a312d4b6831a6b833ea3f4fcd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4ef973817d347fc468c0a1f776d798.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dba1d72ab2c7823a90238b16e032a0.png)
![](https://img.xkw.com/dksih/QBM/2020/4/29/2451839256870912/2452158340653056/STEM/725485b09f224eff998d07c917b39e6d.png?resizew=78)
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