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【多选题】
(选做)如图所示为某一皮带传动装置.主动轮的半径为r1,从动轮的半径为r2.已知主动轮做顺时针转动,转速为n,转动过程中皮带不打滑.下列说法正确的是( )【图片】
A.
从动轮做顺时针转动
B.
从动轮做逆时针转动
C.
从动轮的转 速为r1/nr2
D.
从动轮的转 速为r2/nr1
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参考答案:
举一反三
【单选题】The young man ________ is a friend of mine.
A.
who I had a talk
B.
whom I had a talk with
C.
which I had a talk with
D.
whom I had a talk
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【单选题】Not until ____ finished my homework ___ to watch TV.
A.
I had; I began
B.
had I; I began
C.
I had; did I begin
D.
had I; did I begin
查看完整题目与答案
【简答题】某混合溶液中可能含有的离子如下表所示: 可能大量含有的阳离子 H + 、Ag + 、Mg 2+ 、Al 3+ 、NH 4 + 、Fe 3+ 可能大量含有的阴离子 Cl - 、Br - 、I - 、CO 3 2 — 、AlO 2 — 为探究其成分,进行了以下探究实验。 (1)探究一: 甲同学取一定量的混合溶液,向其中逐滴加入氢氧化钠溶液,产生沉淀的物质的量(n)与加入氢氧化钠溶液的体积(V)的关系如...
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【简答题】X、Y、Z、W都是中学化学中常见物质,其中X、Y、Z 均含有同一种元素,在一定条件下相互转化关系如下(部分生成物已略去)。 (1)若X、W均为单质,且X为气体,Y的水溶液中滴入KSCN溶液后变红。反应③的离子方程式是_________________; ⅱ)Y的水溶液显酸性,原因是(用 离子方程式表示)_____________;将Y溶液蒸干、灼烧,得到的固体物质是________________...
查看完整题目与答案
【单选题】They thought too much about ______.
A.
which I had said
B.
what I had said
C.
that I had said
D.
I had said
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【单选题】No sooner _______ entered the office _______I heard the telephone ringing. A. had I, when B. I had, than C. had I, than D. I had, when
A.
had I, when
B.
I had, than
C.
had I, than
D.
I had, when
查看完整题目与答案
【简答题】①制备纳米TiO 2 的方法之一是TiCl 4 水解生成TiO 2 ·xH 2 O,经过滤、水洗除去其中的Cl - ,再烘干、焙烧除去水分得到粉体TiO 2 。 ②用NaOH测定滤液的浓度:准确称量1.000gNaOH固体质量,配制成250mL溶液,准确量取25.00mL溶液装在碱式滴定管,滴加2滴酚酞作指示剂。把滤液装在酸式滴定管中,调节液面排除气泡后,滤液的凹液面刚好在“0”刻度,滴定NaOH...
查看完整题目与答案
【单选题】提出“仁者寿,智者寿”的是
A.
老子
B.
庄子
C.
孔子
D.
孟子
查看完整题目与答案
【单选题】I walke d through the rooms for no reason ________ particular.
A.
in
B.
for
C.
of
D.
on
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【单选题】【C12】
A.
I had rather
B.
I would rather
C.
I had better
D.
I would had better
查看完整题目与答案
相关题目:
【单选题】The young man ________ is a friend of mine.
A.
who I had a talk
B.
whom I had a talk with
C.
which I had a talk with
D.
whom I had a talk
查看完整题目与答案
【单选题】Not until ____ finished my homework ___ to watch TV.
A.
I had; I began
B.
had I; I began
C.
I had; did I begin
D.
had I; did I begin
查看完整题目与答案
【简答题】某混合溶液中可能含有的离子如下表所示: 可能大量含有的阳离子 H + 、Ag + 、Mg 2+ 、Al 3+ 、NH 4 + 、Fe 3+ 可能大量含有的阴离子 Cl - 、Br - 、I - 、CO 3 2 — 、AlO 2 — 为探究其成分,进行了以下探究实验。 (1)探究一: 甲同学取一定量的混合溶液,向其中逐滴加入氢氧化钠溶液,产生沉淀的物质的量(n)与加入氢氧化钠溶液的体积(V)的关系如...
查看完整题目与答案
【简答题】X、Y、Z、W都是中学化学中常见物质,其中X、Y、Z 均含有同一种元素,在一定条件下相互转化关系如下(部分生成物已略去)。 (1)若X、W均为单质,且X为气体,Y的水溶液中滴入KSCN溶液后变红。反应③的离子方程式是_________________; ⅱ)Y的水溶液显酸性,原因是(用 离子方程式表示)_____________;将Y溶液蒸干、灼烧,得到的固体物质是________________...
查看完整题目与答案
【单选题】They thought too much about ______.
A.
which I had said
B.
what I had said
C.
that I had said
D.
I had said
查看完整题目与答案
【单选题】No sooner _______ entered the office _______I heard the telephone ringing. A. had I, when B. I had, than C. had I, than D. I had, when
A.
had I, when
B.
I had, than
C.
had I, than
D.
I had, when
查看完整题目与答案
【简答题】①制备纳米TiO 2 的方法之一是TiCl 4 水解生成TiO 2 ·xH 2 O,经过滤、水洗除去其中的Cl - ,再烘干、焙烧除去水分得到粉体TiO 2 。 ②用NaOH测定滤液的浓度:准确称量1.000gNaOH固体质量,配制成250mL溶液,准确量取25.00mL溶液装在碱式滴定管,滴加2滴酚酞作指示剂。把滤液装在酸式滴定管中,调节液面排除气泡后,滤液的凹液面刚好在“0”刻度,滴定NaOH...
查看完整题目与答案
【单选题】提出“仁者寿,智者寿”的是
A.
老子
B.
庄子
C.
孔子
D.
孟子
查看完整题目与答案
【单选题】I walke d through the rooms for no reason ________ particular.
A.
in
B.
for
C.
of
D.
on
查看完整题目与答案
【单选题】【C12】
A.
I had rather
B.
I would rather
C.
I had better
D.
I would had better
查看完整题目与答案
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