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【简答题】

Many objects that people use each day started with a idea. These objects have often changed the way we 46 . Some help us to do a job more 47 . Others fill a need or solve a problem. In 1858, Lipman had such an 48 . He took out a pencil, a piece of paper, 49 an eraser. Then he began to write. Sometimes he needed to 50 a word. Each time he had to search under his books and papers to 51 the eraser. “ I wish my eraser would stay in one 52 !” he said. Then Lipman had his idea. He 53 a groove(凹槽) in one end of the pencil. He glued(粘牢) the eraser into the groove. Lipman had solved his problem. Later he thought that others might like to have such a pencil. So he sold his 54 .Some pencils with erasers were 55 . His design earned $ 100000. 小题1: A.study B.live C.sleep D.walk 小题2: A.easily B.correctly C.carefully D.normally 小题3: A.article B.aim C.idea D.action 小题4: A.so B.and C.but D.as 小题5: A.spell B.read C.write D.change 小题6: A.look B.see C.watch D.find 小题7: A.place B.desk C.book D.hand 小题8: A.marked B.prepared C.cut D.invented 小题9: A.books B.pencil C.design D.eraser 小题10: A.wonderful B.expensive C.colourful D.common

题目标签:凹槽
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参考解析:
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刷刷题刷刷变学霸
举一反三

【单选题】海蚀凹槽通常形成于()。

A.
浅海带
B.
潮上带
C.
潮间带
D.
半深海带

【单选题】在铣削一个凹槽的拐角时,很容易产生过切。为避免这种现象的产生,通常采取的措施是()。

A.
降低进给速度
B.
提高主轴转速
C.
提高进给速度
D.
更换直径大的铣刀,提高刀具的刚性

【单选题】海蚀凹槽通常形成于()。

A.
浅海带
B.
潮上带
C.
潮间带
D.
半深海带

【单选题】海蚀凹槽通常形成于()。

A.
浅海带
B.
潮上带
C.
潮间带
D.
半深海带
相关题目:
【单选题】海蚀凹槽通常形成于()。
A.
浅海带
B.
潮上带
C.
潮间带
D.
半深海带
【单选题】在铣削一个凹槽的拐角时,很容易产生过切。为避免这种现象的产生,通常采取的措施是()。
A.
降低进给速度
B.
提高主轴转速
C.
提高进给速度
D.
更换直径大的铣刀,提高刀具的刚性
【单选题】海蚀凹槽通常形成于()。
A.
浅海带
B.
潮上带
C.
潮间带
D.
半深海带
【单选题】在铣削一个凹槽的拐角时,很容易产生过切。为避免这种现象的产生,通常采用的措施
A.
)。
B.
降低进给速度
C.
提高主轴转速
D.
提高进给速度
E.
提高刀具的刚性
【单选题】海蚀凹槽通常形成于()。
A.
浅海带
B.
潮上带
C.
潮间带
D.
半深海带