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第二章课后练习题第1题。
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参考答案：
举一反三
【单选题】Felisa no puede venir esta tarde. Va a la tienda ( ) su madre.
A.
a
B.
para
C.
conmigo
D.
con
查看完整题目与答案
【单选题】阅读 选择Passage 1 When you wake up every day, you have two choices: You can either be positive or negative, an optimist or a pessimist. I choose to be an optimist. I see the glass as half-full, not half-...
A.
1. According to the text, the writer believes that ______. A) half a glass of water is better than nothing B) one should never be satisfied with half a glass of water C) a half-full glass has more water in it than a half-empty glass D) there is no difference between a half-full glass and a half-empty glass
B.
2. The two salesmen spent a night in the distant hills because ______. A) they thought it was romantic to do so B) they got lost in the wild C) they wanted to kill wolves to make money D) they had made a bet
C.
3. One salesman cried "wake up" after he saw the wolves because ______. A) he was frightened B) he wanted to save his friend's life C) he was playing a joke on his friend D) he was excited about his opportunity to make money
D.
4. According to the context, the writer thinks that the man with the sign "new-style compact car" ______. A) is a very rich person B) must have been in a bad mood C) is a person who has a positive attitude D) must have gone out of his mind
E.
5. The last sentence of the passage tells us ______. A) how to a make a good doughnut B) how to judge if a doughnut is good C) to see the positive side in everything D) to keep our eyes open for everything
查看完整题目与答案
【单选题】化学发光的基本原理是发光物由于（）
A.
在一定波长激发光照射下发光
B.
在化学反应中获得能量而发光
C.
在电子激发态时发光
D.
在电子激发态返回基态时释光放能量而发光
E.
某物在化学反应中生成发光物而发光
查看完整题目与答案
【单选题】在下图的程序实验中,同时按下“启动SB1”和“停止SB2”按钮,不松手,接触器KM1线圈( )
A.
接通
B.
断开
C.
由接通变断开
D.
由断开变接通
查看完整题目与答案
【单选题】化学发光的基本原理是发光物由于
A.
在一定波长激发光照射下发光
B.
在化学反应中获得能量而发光
C.
在电子激发态时发光
D.
在电子激发态返回基态时释放能量而发光
E.
某物在化学反应中生成发光物而发光
查看完整题目与答案
【单选题】化学发光的基本原理是发光物由于
A.
在一定波长激发光照射下发光
B.
在化学发应中获得能量而发光
C.
在电子激发态时发光
D.
在电子激发态返回基态时释放能量而发光
E.
某物在化学反应中生成发光物而发光
查看完整题目与答案
【单选题】某实验小组用细菌甲(异养生物)作为材料来探究不同条件下种群增长的特点,设计了三个实验组,每组接种相同数量的细菌甲后进行培养,培养过程中定时更新培养基,三组的更新时间间隔分别为 3h、10h、23h,得到a、b、c三条种群增长曲线,如图所示。下列叙述错误的是
A.
细菌甲能够将培养基中的有机物分解成无机物
B.
培养基更换频率的不同，可用来表示环境资源量的不同
C.
在培养到 23h之前，a组培养基中的营养和空间条件都是充裕的
D.
培养基更新时间间隔为 23h时，种群增长不会出现J型增长阶段
查看完整题目与答案
【单选题】利润 = (实际销售量 — 保本销售量) x ()
A.
贡献边际率
B.
单位利润
C.
单位售价
D.
单位贡献边际
查看完整题目与答案
【单选题】在下图的程序实验中,同时按下“启动SB1”按钮和“停止SB2”按钮,接触器线圈()
A.
断开
B.
接通
C.
先断开后接通
D.
先接通后断开
查看完整题目与答案
【单选题】在下图的程序实验中,同时按下“启动SB1”和“停止SB2”接钮,接触器线圈( )
A.
接通
B.
断开
C.
无任何动作
D.
先接通后断开
查看完整题目与答案
相关题目：
【单选题】Felisa no puede venir esta tarde. Va a la tienda ( ) su madre.
A.
a
B.
para
C.
conmigo
D.
con
查看完整题目与答案
【单选题】阅读 选择Passage 1 When you wake up every day, you have two choices: You can either be positive or negative, an optimist or a pessimist. I choose to be an optimist. I see the glass as half-full, not half-...
A.
1. According to the text, the writer believes that ______. A) half a glass of water is better than nothing B) one should never be satisfied with half a glass of water C) a half-full glass has more water in it than a half-empty glass D) there is no difference between a half-full glass and a half-empty glass
B.
2. The two salesmen spent a night in the distant hills because ______. A) they thought it was romantic to do so B) they got lost in the wild C) they wanted to kill wolves to make money D) they had made a bet
C.
3. One salesman cried "wake up" after he saw the wolves because ______. A) he was frightened B) he wanted to save his friend's life C) he was playing a joke on his friend D) he was excited about his opportunity to make money
D.
4. According to the context, the writer thinks that the man with the sign "new-style compact car" ______. A) is a very rich person B) must have been in a bad mood C) is a person who has a positive attitude D) must have gone out of his mind
E.
5. The last sentence of the passage tells us ______. A) how to a make a good doughnut B) how to judge if a doughnut is good C) to see the positive side in everything D) to keep our eyes open for everything
查看完整题目与答案
【单选题】化学发光的基本原理是发光物由于（）
A.
在一定波长激发光照射下发光
B.
在化学反应中获得能量而发光
C.
在电子激发态时发光
D.
在电子激发态返回基态时释光放能量而发光
E.
某物在化学反应中生成发光物而发光
查看完整题目与答案
【单选题】在下图的程序实验中,同时按下“启动SB1”和“停止SB2”按钮,不松手,接触器KM1线圈( )
A.
接通
B.
断开
C.
由接通变断开
D.
由断开变接通
查看完整题目与答案
【单选题】化学发光的基本原理是发光物由于
A.
在一定波长激发光照射下发光
B.
在化学反应中获得能量而发光
C.
在电子激发态时发光
D.
在电子激发态返回基态时释放能量而发光
E.
某物在化学反应中生成发光物而发光
查看完整题目与答案
【单选题】化学发光的基本原理是发光物由于
A.
在一定波长激发光照射下发光
B.
在化学发应中获得能量而发光
C.
在电子激发态时发光
D.
在电子激发态返回基态时释放能量而发光
E.
某物在化学反应中生成发光物而发光
查看完整题目与答案
【单选题】某实验小组用细菌甲(异养生物)作为材料来探究不同条件下种群增长的特点,设计了三个实验组,每组接种相同数量的细菌甲后进行培养,培养过程中定时更新培养基,三组的更新时间间隔分别为 3h、10h、23h,得到a、b、c三条种群增长曲线,如图所示。下列叙述错误的是
A.
细菌甲能够将培养基中的有机物分解成无机物
B.
培养基更换频率的不同，可用来表示环境资源量的不同
C.
在培养到 23h之前，a组培养基中的营养和空间条件都是充裕的
D.
培养基更新时间间隔为 23h时，种群增长不会出现J型增长阶段
查看完整题目与答案
【单选题】利润 = (实际销售量 — 保本销售量) x ()
A.
贡献边际率
B.
单位利润
C.
单位售价
D.
单位贡献边际
查看完整题目与答案
【单选题】在下图的程序实验中,同时按下“启动SB1”按钮和“停止SB2”按钮,接触器线圈()
A.
断开
B.
接通
C.
先断开后接通
D.
先接通后断开
查看完整题目与答案
【单选题】在下图的程序实验中,同时按下“启动SB1”和“停止SB2”接钮,接触器线圈( )
A.
接通
B.
断开
C.
无任何动作
D.
先接通后断开
查看完整题目与答案
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