题目内容
（请给出正确答案）
生产性噪声是由机器转动、气体排放、工件撞击、摩擦等产生的。生产性噪声可分为()三类。
A．振动性噪声、机械性噪声、电磁性噪声
B．冲击性噪声、机械性噪声、电磁性噪声
C．气体性噪声、机械性噪声、电磁性噪声
D．空气动力噪声、机械性噪声、电磁性噪声
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更多“生产性噪声是由机器转动、气体排放、工件撞击、摩擦等产生的。生…”相关的问题
第1题
That the author mentions the old Romans is ______.
A．To compare the old Romans with today's people
B．to give an example
C．to show human beings in the past know nothing better
D．to indicate human beings are used to bloodthirsty
第2题
That the author mentions the old Romans is ______.
A．to compare the old Romans with today's people
B．to give an example
C．to show human beings in the past know nothing better
D．to indicate human beings used to be bloodthirsty
第3题
The author mentions the Balkans in the passage in order to explain why ______.
A．Indo-European languages were slow to spread in Old Europe
B．the inhabitants of Old Europe were not able to prevent Indo-European incursions
C．the use of the Old European script. declined
D．the Old European culture survived for a time after the Indo-European incursions
第4题
In this passage, when the author mentions "hundreds of deaths", he refers to______.
A．the deaths of hundreds of ova
B．the deaths caused by abortion
C．the natural deaths of old people
D．the deaths of hundred of boaies
第5题
In the second paragraph the author mentions the tollbooth collector to ______.
A．mean he will get benefits from the telecomm field
B．show he is too old to shift to a new position
C．console him on having been replaced by a machine
D．blame the PC for his unemployment
第6题
In the second paragraph the author mentions the tollbooth collector to______.
A．mean he will get benefits from the telecomm field
B．show he is too old to shift to a new position
C．console him on having been replaced by a machine
D．blame the PC for his unemployment
第7题
In the second paragraph the author mentions the tollbooth collector to
A．mean he will get benefits from the telecomm field.
B．show he is too old to shift to a new position.
C．console him on having been replaced by a machine.
D．blame the PC for his unemployment.
第8题
The author mentions the ports of Los Angeles and Long Beach to ______.
［A］prove they are the largest ports in the United States
［B］demonstrate they create many new job opportunities
［C］highlight that shipping is less glamorous than making movies
［D］emphasize the role of shipping in southern California's economy
第9题
When the author mentions "the tiny, dusty little places", he refers to ______.
A．very dirty bookshops
B．very old bookshops
C．very useful bookshops
D．very handy bookshops
第10题
According to the text, the author mentions plutonium in paragraph 1 to _____.
A．estimate the amount of nuclear material in Europe.
B．exemplify one of the possible causes of lung cancer.
C．highlight the measures needed to prevent lung cancer.
D．show the destructive properties of industrial waste materials.
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