![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e359ac3ad2ddb10a4c37673f4e10f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2412c822e0cf76302c127a3959382f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7dbb416ec1ff1984a724a4f48bf692.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2acdc25340326a9c43820194aedf295e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
2 . 酒驾是严重危害交通安全的违法行为.为了保障交通安全,根据国家有关规定:100mL血液中酒精含量达到20⁓79mg的驾驶员即为酒后驾车,80mg及以上认定为醉酒驾车,都属于违法驾车.假设某驾驶员喝了一定量的酒后,其血液中的酒精含量上升到了1mg/mL.如果停止喝酒以后,他血液中的酒精含量会以每小时25%的速度减少,要保证他不违法驾车,则他至少要休息(其中取)( )
A.7小时 | B.6小时 | C.5小时 | D.4小时 |
3 . 今年8月24日,日本不顾国际社会的强烈反对,将福岛第一核电站核污染废水排入大海,对海洋生态造成不可估量的破坏.据有关研究,福岛核污水中的放射性元素有21种半衰期在10年以上;有8种半衰期在1万年以上.已知某种放射性元素在有机体体液内浓度与时间
(年)近似满足关系式
(
,
为大于0的常数且
).若
时,
;若
时,
.则据此估计,这种有机体体液内该放射性元素浓度
为
时,大约需要
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5219e7db4b2d93eb85630908b9e3c7f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8238fba9b391d01ceb071e78ee221035.png)
A.函数![]() |
B.![]() |
C.函数![]() |
D.![]() |
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e00793d2045d73c572ad48a8ed64424c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e00793d2045d73c572ad48a8ed64424c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77ab1256702aef4e9f1a5eb6c12ecc96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbd67f60f04c278bdd867fdb3979dfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4f150ab98bde511e0f65d9bafab031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d970300a188a200b4d0c4e34a6b368b3.png)
A.星等值越小,星星就越亮 |
B.1等星的亮度恰好是6等星的100倍 |
C.若星体甲与星体乙的星等值的差小于2.5,则星体甲与星体乙的亮度的比值小于![]() |
D.若星体甲与星体乙的星等值的差大于10,则星体甲与星体乙的亮度的比值小于![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da5fa97c9216c6e8f4881832870d4723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23e9cd35fe62ed0aaa4a8b5c67d7dd7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a964580f225a18d0ed933416dfb350c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da5fa97c9216c6e8f4881832870d4723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7242b2ab643f9470da77e29d043b893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.4 | B.12 | C.![]() | D.![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7179c645736d68c90023f83d7f11ed01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ba5e494c2c83e3ddccaeb9db064d97b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87a26e93874376e3bbaf6d5532075e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7dc156b631b815fea299cdf13feb4dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50af11c345056215054f7cfe679939da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b02e4fbda8319948741fd3e7fefbe456.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c7572463225bb3b65cb371f4496440.png)
9 . 岭南古邑的番禺不仅拥有深厚的历史文化底蕴,还聚焦生态的发展.下图是番禺区某风景优美的公园地图,其形状如一颗爱心.图
是由此抽象出来的一个“心形”图形,这个图形可看作由两个函数的图象构成,则“心形”在
轴上方的图象对应的函数解析式可能为( )
A.![]() | B.![]() |
C.![]() | D.![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ed142422c641fb5f033155027a4fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27d0ae6b06a4b02496c7ae16251ffed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c9c902c267b163bf6986d6a865d668.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9c651447c78f6511c378a4286fba8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614ee30a82aa5acd4649de91a4947184.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2e1ec133db94bc03d3b0b441b0fccb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec9e930c507f35ae666354e6a0cb70d5.png)
(参考数据;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25522700e456c259978a6d762e818572.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35b7cfcc147916ae7eeb5d557fea945e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2c4d12b3a705daab723ab243b6cc88.png)