在图所示的电路中，电源两端的电压为6V保持不变，R₁=R₂=10Ω，开关S₁闭合后，下列说法中正确的是  （）

Zero Waste Awards

    Who should enter?

    Entries(参赛作品) are welcomed from anyone who processes waste. While we expect

    most entries to come from the UK, we welcome international entries, too. Entrants have been split into the following groups: private sector, public sector, community sector and partnerships.

    What are the categories?

    There're five categories which are based on the Waste Hierarchy(层级). We appreciate that companies will have different strengths within those categories as they work towards Zero Waste. The broad categories are: waste prevention, re-use, recycle/recover, energy recovery, general.

    How do I enter?

    Submitting an entry is really easy! Just follow these few simple steps:

    1) Carefully read through the category information;

    ). Write your entry--it should be a maximum of 1,500 words and a word document;

    3) Arrange your supporting material into a single document--maximum six pages long;

    4) Complete the simple online entry form.

    Important dates

    While entries are welcomed all year round, these are key dates—this is to give the judges plenty of time to read through all the entries! These are listed in entry deadlines column below. Don't worry if you have just missed one of the entry deadlines, your submission will be automatically entered into the next session.

    You can submit a maximum of two entries per year—six months apart.

    Awards

    We understand that working towards Zero Waste is an ongoing journey and as such the

    Zero Waste Awards scheme offers organizations a structure to celebrate their progress along the way. The four awards are: Gold (76-100), Silver (51-75), Bronze (26-50), Highly Commended(0-25).

下面关于生物群落结构的叙述，错误的是

名著阅读与专题。
①下面这段文字选自《钢铁是怎样炼成的》，读后答题。
         医生建议他再做一次手术，他冷冷地、生硬地说：“到此为止。我可够了。我已经向科学献出了我的一部分鲜血，剩下的留给我做点别的事吧。”
        选文中的“他”指的是主人公_________，“做点别的事”具体是指____________一事，他的精神——                       的人格操守应成为青少年永恒的人生精神坐标。
②长城是中华民族的象征，是每个炎黄子孙心中永恒的爱，然而你的好朋友晓云游玩过长城回来后，兴高采烈地告诉你，她在长城上刻下了自己的名字。你听了以后，该怎样对她说？
你说：