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一均质正方体放入水中,静止时物体有 的体积浸入水中,物体的密度是 ____ kg/m3;若把该物体放入密度为0.8×103kg/m3的酒精中后;则该物体下表面受到水的压强P水与受到酒精的压强P酒的关系是P水 ____ P酒(选填“>”、“=”、“<”=).

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0.6×103,=

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    Research suggests that at least 64% of people now spend up to four hours daily of spare time in front of a screen. Just as TV watching has been linked to higher chances of being fat and getting diseases, this extra sedentary time is bad news for our health.

    ⒈Choose outdoor activities over technology

    When you're at home, make it a rule that you can't be online if the sun is shining. Instead, you have to go for a walk, ride a bike, swim or get some other kind of healthy, physical activity for at least an hour before you can pull out your phone or tablet, or take a seat at the computer. This rule should be fit for everyone in your family.

    ⒉Limit social media use

    Social networks have changed computer and mobile use for people of all ages. Whether it's Facebook, Twitter, Instagram or Snapchat. Limit the amount of time you spend on social media. Avoid aimless browsing(浏览) and give your time online a purpose research holidays or catch up on the news of the day. Then log off.

    ⒊Save time for reading

    Challenge yourself to read at least 30 pages of a great book before you check your computer or mobile phone. Pick the right reading material and you'll soon find you've discovered an enjoyable pastime.

    ⒋Create projects for yourself

    It's amazing how much you can achieve when you're not glued to (长时间盯着) a screen. Do a list of one-hour evening projects. Some suggestions are organizing kitchen cupboards, cleaning your bedroom. Then try to do one each evening.