依据《全国生态环境保护纲要》，矿产资源开发利用中，严禁在（）

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问题不定项选择

依据《全国生态环境保护纲要》，矿产资源开发利用中，严禁在（）内采矿。

A.森林公园区

B.风景名胜区

C.自然保护区

D.水土流失重点防治区

答案

参考答案：A, B, C

单项选择题

Which of the following statements regarding growth companies and growth stocks is TRUE A growth:（）

A. company has management that has the ability to consistently select projects that earn higher returns than required by their risk.

B. company will not earn below normal returns.

C. company will earn above normal returns given its risk.

计算题

如图所示，用6m长的轻绳将A、B两球相连，两球相隔0.8s先后从C点以4.5m/s的初速度水平抛出．那么，将A球抛出后经多长时间，A、B间的轻绳被拉直？(g=10m/s2)