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【单选题】

The principal purpose of adjustment of the magnetic compass is to eliminate（）as far as possible.

A、variation

B、compass error

C、deviation

D、earth's magnetic force

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第1题
[单选题] 最基本的保护层是油漆。（）

A、The principal protective coating is paint.  B、The principal protective coating is cement wash.  C、The principal protective coating is bitumen.  D、The principal protective coating is varnish.  

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第2题
[单选题] The health seeking youths can following the（）of natural living.

A、principles  B、principals  C、principality  D、prince  

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第3题
[判断题] The principal is usually the importer.

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第4题
[判断题] For Krashen, the affective filter is the principal source of individual difference in second language acquisition.（）

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第5题
[单选题] Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.

A、Greenwich celestial meridian  B、hour circle of the body  C、local celestial meridian  D、vertical circle of the body  

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第6题
[单选题] In the horizon system of coordinates what is equivalent to the equator on the Earth?（）.

A、Prime vertical circle  B、Principal vertical circle  C、Parallels of altitude  D、Horizon  

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第7题
[单选题] They understand the （） of automatic sludge discharging of the purifierBut they are not good in practice.

A、principle  B、principal  C、cause  D、case  

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第8题
[单选题] A time diagram is a diagram on the plane of the（）.

A、celestial meridian  B、celestial equator  C、celestial horizon  D、principal vertical circle  

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第9题
[] Stability is determined principally by the location of the center of gravity and the（）.

A、A.aft perpendicular  B、B.center of buoyancy  C、C.keel  D、D.center of flotation  

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第10题
[单选题] Stability is determined principally by the location of two points in a vessel: the center of buoyancy and the（）.

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