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提问人：网友lixin080108 发布时间：2022-01-14

[主观题]

An aluminum piston has lower inertia and higher coefficient of（）compared to that of cast iron

A．viscosity

B．twisting moments

C．inertia

D．thermal expansio

简答题官方参考答案（由简答题聘请的专业题库老师提供的解答）

更多“An aluminum piston has lower inertia and higher coefficient of（）compared to that of cast iron”相关的问题

第1题

An aluminum piston has lower inertia and higher coefficient of _____ compared to that of c

ast iron.

A.viscosity

B.twisting moments

C.inertia

D.thermal expansion

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第2题

A solid aluminum sphere of radius R has moment of inertia I about an axis through its center. Will the moment of inertia about a central axis of a solid aluminum sphere of radius 2R be

A．2I

B．4I

C．8I

D．32I

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第3题

In a two-stroke engine, the piston consists of a lower part, which is named as and usually

made of , and a upper part, which is referred to as and made of .

A.low-half, cast iron; top-half, heat-resistant steel

B.low-half, aluminum; top-half, stainless steel

C.piston skirt; cast iron; piston crown; heat-resistant steel

D.piston skirt; aluminum; piston crown; stainless steel

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第4题

Cold clearances between the skirt of an aluminum piston and the cylinder liner is about __

__________________.

A.twice as large as with a cast iron piston

B.the same size as with a cast iron piston

C.half as large as with a cast iron piston

D.the same size as the crown of an aluminum piston

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第5题

Ring groove inserts are occasionally used on aluminum alloy piston to_______.A.reduce the

Ring groove inserts are occasionally used on aluminum alloy piston to_______.

A.reduce the ring groove wear rate

B.seal against crankcase vapors

C.lessen the wear on aluminum part of the cylinder

D.allow for the greater expansion rate of aluminum

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第6题

phosphor, that has been first excited by light of higher frequency. Higher energy photons are first absorbed, and then lower energy photons are emitted.

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第7题

According to Maslow's need theory,______.A、lower needs and higher needs should be s

According to Maslow's need theory,______.

A、lower needs and higher needs should be satisfied after an individual travels

B、higher level needs take more efforts to fulfill

C、an individual is motivated to travel after he has lower and higher needs

D、lower needs should be satisfied before higher level needs are demanded attention

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第8题

The lower section of a piston is called the ______.A.landB.skirtC.crownD.plate

The lower section of a piston is called the ______.

A.land

B.skirt

C.crown

D.plate

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第9题

【单选题】For a holding period of one year the expected return on a consol is _____ the higher is the price of the consol today, and _____ the higher is the price of the consol next year.

A．higher; higher

B．higher; lower

C．lower; higher

D．lower; lower

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