在相同起升高度情况下，双箱形结构主梁的桥吊总高度比单箱梁要小（）m左右。
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Avesselisheadingmagneticeastanditsmagneticcompassindicatesaheadingof086°.Whichactionshouldbetakentoremovethiserrorduringcompassadjustment?（）
A. Iftheblueendsofthemagnetsareaft，andthefore-and-afttrayisatthetop，youshouldaddsomemagnets.
B. Iftheblueendsofthemagnetsareaftyoushouldlowerthefore-and-afttray
C. Iftheblueendsofthemagnetsareaft，andthefore-and-afttrayisatthetop，youshouldreversethemagnets
D. Iftheblueendsofthemagnetsareforward，andthefore-and-afttrayisatthebottom，youshouldaddsomemagnets
Avesselisheadingmagneticnorthanditsmagneticcompassindicatesaheadingof003°.Whatactionshouldbetakentoremovethiserrorduringcompassadjustment?（）
A. Movethequadrantalspheresclosertothecompass
B. Raisetheheelingmagnetiftheredendisup
C. RemovesomeoftheFlindersbar
D. Raiseorlowertheathwartshipmagnets
科学家测定了一种鱼类生活环境和血液以及尿液的渗透压，以冰点下降度为单位，结果依次是1.85、0.8和0.7，试问这种鱼类最可能是：（）
A. 鲤鱼
B. 鲨鱼
C. 带鱼
D. 草鱼
Avesselisheadingmagneticnorthwestanditsmagneticcompassindicatesaheadingof317°.Whatactionshouldbetakentoremovethiserrorduringcompassadjustment?（）
A. Ifthequadrantalspheresareoutasfaraspossiblereplacethemwithsmallerspheres
B. Ifthequadrantalspheresareinasfaraspossibleremoveoneofthespheres
C. Ifthequadrantalspheresareinasfaraspossiblereplacethemwithsmallerspheres
D. Ifthequadrantalspheresareoutasfaraspossible，movethequadrantalspheresin
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