【题目】某化学实验小组同学利用以下实验装置制取氨气,并探究氨气的性质(部分仪器已略去)。请回答:
(1)实验室制备氨气的化学方程式为______________________。
(2)用装置B收集氨气时,应选择氨气的进气口是________(填“a”或“b”),并说明选择的理由是________________________________。
(3)打开装置B中的止水夹c,若观察到烧瓶内产生了红色喷泉,则说明氨气具有的性质是________________、________________。
(4)为防止环境污染,以下装置(盛放的液体均为水)可用于吸收多余氨气的是________(填序号)。
科目:高中地理 来源: 题型:
【题目】短文改错
假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文中共有10处语言错误,每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加:在缺词处加一个漏字符号(/\),并在其下面写出该加的词;
删除:把多余的词用斜线(\)划掉;
修改:在错词下画一横线,并在该词下面写出修改后的词。
注意:1. 每处错误及其修改均仅限一词;
2. 只允许修改10处,多者(从第11处起)不计分。
Recently, people were moved by a story taking the place in Thailand. It told about a girl whom had a quarrel with her mother and ran away from home. After several days, the girl walked into a restaurant in hungers. A man who was the cook invites her to sit down and then made some delicious food for him. The girl was very surprising. Then the cook told the girl that a woman took a photo and asked him whether he seen the girl. But the woman gave him some money to cook for the girl if she turned up. Until then the girl realized how greatly her mother was and she should be grateful on her.
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科目:高中地理 来源: 题型:
【题目】短文改错
假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文中共有10处语言错误,每句中最多有两处。错误涉及一个单词的增加、删除或修改。
增加:在缺词处加一个漏词符号(∧),并在其下面写出该加的词。
删除:把多余的词用斜线(\)划掉。
修改:在错的词下划一横线,并在该词下面写出修改后的词。
注意:
1. 每处错误及其修改均仅限一词;
2. 只允许修改10处,多者(从第11处起)不计分。
Last month while I was walking in the street, the foreigner came towards me. She seemed to be losing. She asked me if I could help him. I said yes, but when she started talking, I couldn’t understand that she said. I could only say "I don’t know", and then slowly walk away. Though I have studied English for six years, but I still can’t understand English good enough. I know I’m not interested in English and I’ve also been very lazy to study it. Now I know the importances of learning English. I’ve decided change my attitude towards English and work hard on it.
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科目:高中地理 来源: 题型:
【题目】如图所示,水平放置的两导轨P、Q间的距离L=0.5 m,垂直于导轨平面的竖直向上的匀强磁场的磁感应强度B=2 T,垂直于导轨放置的ab棒的质量m=1 kg,系在ab棒中点的水平绳跨过定滑轮与重量G=3 N的物块相连。已知ab棒与导轨间的动摩擦因数μ=0.2,电源的电动势E=10 V、内阻r=0.1 Ω,导轨的电阻及ab棒的电阻均不计。要想ab棒处于静止状态,电阻R应在哪个范围内取值?(g取10 m/s2)
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科目:高中地理 来源: 题型:
【题目】短文改错
假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文中共有10处语言错误,每句中最多有两处。错误涉及一个单词的增加、删除或修改。
增加:在缺词处加一个漏词符号(∧),并在其下面写出该加的词。
删除:把多余的词用斜线(\)划掉。
修改:在错的词下划一横线,并在该词下面写出修改后的词。
注意:
1. 每处错误及其修改均仅限一词;
2. 只允许修改10处,多者(从第11处起)不计分。
Dear guests,
On behalf of our school, I would like to express our warm welcome to you. We are luck to have you here in middle of our English Week Activities. As planning, we have English Talent Show today. The purpose of this program was to develop our interest in English learning and practically abilities in listening and speaking. The program consists in the following activity: recitation, singing, word spelling, storytelling and so on. The show will begin at two o’clock this afternoon at the Student Centre. Dear guests, we are welcome to take part in some activities. I hope we students will be benefit from your presence but I sincerely wish you a pleasant time with us.
Thank you.
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科目:高中地理 来源: 题型:
【题目】一理想变压器原、副线圈匝数比n1∶n2=11∶5。原线圈与正弦交变电源连接,输入电压u如图所示。副线圈仅接入一个10Ω的电阻,则( )
A.流过电阻的电流是20A
B.与电阻并联的电压表的示数是100V
C.经过1分钟电阻发出的热量是6×103 J
D.变压器的输入功率是1×103 W
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【题目】温度传感器广泛应用于室内空调、电冰箱等家用电器中,它是利用热敏电阻的阻值随温度变化的特殊性来工作的。如图甲所示,电源的电动势E=9 V,内阻不计;G为灵敏电流表,内阻Rg保持不变;R为热敏电阻,其电阻阻值与温度的变化关系如图乙所示。闭合开关S,当R的温度等于20°C时,电流表示数I1=2 mA。求:当电流表的示数I2=3.6 mA时热敏电阻的温度。
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科目:高中地理 来源: 题型:
【题目】如图所示,原长分别为L1和L2、劲度系数分别为k1和k2的轻质弹簧竖直悬挂在天花板上,两弹簧之间有一质量为m1的物体,最下端挂着质量为m2的另一物体,整个装置处于静止状态。
(1)这时两个弹簧的总长度为多大?
(2)若用一个质量为M的平板把下面的物体竖直缓慢地向上托起,直到两个弹簧的总长度等于两弹簧的原长之和,求这时平板受到上面物体m2的压力。
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【题目】如图所示,传送带保持v=4 m/s的速度水平匀速运动,将质量为1 kg的物块无初速地放在A端,若物块与皮带间动摩擦因数为0.2,A、B两端相距6 m,则物块从A到B的过程中,皮带摩擦力对物块所做的功为多少?产生的摩擦热又是多少?(g取10 m/s2)
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