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【单选题】
平均直径为 D 的圆环以匀角速度 w 转动,当不满足强度要求时,可采取 措施解决。A.
w 、D不变，增加截面尺寸
B.
w 不变，加大平均直径D
C.
w、D不变，改低碳钢为高碳钢
D.
减小D或限制转速至某一允许值，其余不变
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反馈参考答案：
举一反三
【单选题】为了把2-戊炔转变为顺-2-戊烯,应采用下列哪一个反应条件?
A.
BH3
B.
H2（一分子）Pd（Lindlar催化剂）
C.
H2（两分子）Pd（Lindlar催化剂）
D.
Na、液氨
【单选题】Lightning and thunder are related events. Lightning is a sudden, violent flash of electricity that occurs between a cloud and the ground or between two clouds in the sky. A lightning bolt can be sever...
A.
Compare and Contrast
B.
Spatial
C.
Chronological
D.
Problem and Solution
E.
Cause and Effect
F.
Order of Importance / Sequence
【单选题】Which of the following can be inferred from the passage about the digital approach to the processing of sound?
A.
It was developed in competition with wax-cyclinder recording technology.
B.
It has resulted in the first distortion-free playback system.
C.
It has been extensively applied to nonmusical sounds.
D.
It cannot yet process music originally recorded on analog equipment.
E.
It is not yet capalbe of reprocessing old recordings in a completely distortion-free manner.
【简答题】Different types of noise Some noises can be considered pleasant e.g. the sound of a 34 _____ in a town To investigate this, researchers may use methods from 35 _____ sciences e.g. questionnaire
【简答题】B1U3 Exercise 6 Banked close ___________ ___________ ___________ ___________ ___________ ___________ ___________ ___________ ___________ ___________
【简答题】Different types of noise Some noises can be considered pleasant e.g. the sound of a 34 in a town
【单选题】Lightning and thunder are related events. Lightning is a sudden, violent flash of electricity that occurs between a cloud and the ground or between two clouds in the sky. A lightning bolt can be seve...
A.
Space Relationship
B.
Time Sequence
C.
Examples and Illustrations
D.
Compare and Contrast
E.
Cause and Effect
F.
Addition (Enumeration) simple listing
【单选题】The sound /e/ can be described with “________, semi-close, unrounded.”
A.
front
B.
central
C.
lax
D.
back
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