练习册

  • 练习册
  • 试题
    精英家教网 > 初中地理 > 题目详情

    【题目】有两个集气瓶，分别充满空气和氮气，试用简单的方法加以鉴别。

    ________________________________________________________________________。

    【答案】用燃着的木条分别伸入两个集气瓶中，木条继续燃烧的是空气，木条立即熄灭的是氮气

    【解析】

    试题分析：氮气不支持燃烧，而空气中含有支持燃烧的氧气，所以可以：用燃着的木条分别伸入两个集气瓶中，木条继续燃烧的是空气，木条立即熄灭的是氮气。

    练习册系列答案
    年级 高中课程 年级 初中课程
    高一 高一免费课程推荐！ 初一 初一免费课程推荐！
    高二 高二免费课程推荐！ 初二 初二免费课程推荐！
    高三 高三免费课程推荐！ 初三 初三免费课程推荐！
    相关习题

    科目：初中地理 来源： 题型：

    【题目】B

    These are Cara and Ben. They are twins(双胞胎). They are twelve. This is their bedroom. It’s a nice room. There are two beds in the room. The yellow bed is Cara’s and that green one is Ben’s. The twins have one desk and two chairs. The chairs look the same. Cara’s sweater is on his bed. Ben’s coat is on his chair. Their clock, books and pencil-boxes are on the desk. Their schoolbags are behind the chairs.

    根据材料内容选择最佳答案。

    【1】 Cara and Ben are _______.

    A. brother and sister B. brothers C. sisters D. friends

    【2】 Cara and Ben have _______.

    A. two chairs and one desk B. two desks and chair

    C. two chairs and two desks D. one desk and one chair

    【3】 Cara’s _______ is yellow and Ben’s _______ is green.

    A. chair; bed B. sweater; sweater C. bed; bed D. bed; chair

    【4】Cara’s sweater is _______.

    A. on his bed B. on Ben’s bed C. on the chair D. on the desk

    【5】Which（哪一个） is right（正确的）?

    A. Their class is very nice. B. Their two beds look the same.

    C. Their schoolbags are under the chairs. D. They live in the same room.

    查看答案和解析>>

    科目：初中地理 来源： 题型：

    【题目】—What can I do for you?

    —Err, I want a glass of milk, some bread and .

    A. some chickens

    B. any chickens

    C. some chicken

    查看答案和解析>>

    科目：初中地理 来源： 题型：

    【题目】有三只相同的灯泡组成的电路，若其中一只灯泡突然熄灭（灯丝断），则下面说法中正确的是（ ）

    A. 如果电路是串联电路，另外两只灯泡一定正常发光

    B. 如果电路是并联电路，另外两只灯泡一定也熄灭

    C. 如果电路是串联电路，另外两只灯泡一定也熄灭

    D. 如果电路是并联电路，另外两只灯泡一定正常发光

    查看答案和解析>>

    科目：初中地理 来源： 题型：

    【题目】组成原子核的粒子是（ ）

    A．带正电的质子和带负电的电子

    B．带正电的质子和不带电的中子

    C．带正电的质子、带负电的电子和不带电的中子

    D．带负电的电子和不带电的中子

    查看答案和解析>>

    科目：初中地理 来源： 题型：

    【题目】My uncle likes sports very much. He loves soccer ball, basketball, baseball, tennis and more. He plays baseball and basketball very well. He likes to watch the sports games on TV. He plays sports every day. He has a small(小的) sports collection. He has 3 tennis rackets, 2 baseballs, 3 basketballs and a soccer ball.

    根据短文内容判断正(T)误(F)。

    【1】My uncle doesn’t like sports, but he has a sports collection.

    【2】He plays baseball and basketball very well.

    【3】He likes to watch the sports collection on TV.

    【4】He watches TV and plays sports every day.

    【5】His collection is small: 3 tennis rackets, 2 baseballs, 3 basketballs and a soccer ball.

    查看答案和解析>>

    科目：初中地理 来源： 题型：

    【题目】下列反应属于缓慢氧化的是( )。

    A．动植物的呼吸作用 B．铁丝在氧气中燃烧

    C．硫在空气中燃烧 D．木炭在空气中燃烧

    查看答案和解析>>

    科目：初中地理 来源： 题型：

    【题目】My name is Jenny Brown .Jenny is my __________ name .

    A. family B. first C. last D. full

    查看答案和解析>>

    同步练习册答案