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【单选题】
当要求链传动的速度高且噪声小时，宜选用（ ）。A.
滚子链
B.
牵引链
C.
齿形链
D.
起重链
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】简述界定调查问题的基本操作流程。
【单选题】已知集合A={x|x＜0}，B={x|-1＜x＜1}，则A∩B=（ ）
A.
{x|x＜-1}
B.
{x|-1＜x＜0}
C.
{x|0＜x＜1}
D.
{x|x＜1}
【单选题】She hoped to become an engineer, but her mother wanted her to major in law rather than in engineering .
A.
工程
B.
医学
C.
商科
D.
建筑
【简答题】Tom was ten years old, and he was a very lazy boy, He didn't like doing any work. He had to go to school of course, but he didn't study hard there and tried to do as little work as possible. His fathe...
【简答题】Tom was ten years old, and he was a very lazy boy, He didn't like doing any work. He had to go to school of course, but he didn't study hard there and tried to do as little work as possible. His fathe...
【简答题】Jack was ten years old and he was a very lazy boy. He didn't like doing any work. He had to go to school, of course, but he didn't study hard there and tried to do little work. His father and mother w...
【简答题】Jack was ten years old and he was a very lazy boy. He didn’t like doing any work. He had to go to school, of course, but he didn’t study hard there and tried to do little work. His father and mother w...
【简答题】阅读理解。 John was ten years old and he was very lazy. He had to go to school, of course, but he was bored there and tried to do as little work as possible. His father and mother were both doctors and the...
【简答题】Jack was ten years old and he was a very lazy boy. He didn’t like doing any work. He had to go to school, of course, but he didn’t study hard there and tried to do little work. His father and mother w...
【单选题】已知集合A=｛x｜x+1＞0｝，B=｛x｜x 2 -x＜0｝，则A∩B=（ ）
A.
｛x｜x＞-1｝
B.
｛x｜-1＜x＜1｝
C.
｛x｜0＜x＜1｝
D.
｛x｜-1＜x＜0｝
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