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波长λ1=589nm的钠黄光垂直照射在空气劈尖上，干涉条纹间距l1=0.23mm，当另一波长为λ2的单色光垂直照射时，干涉条纹间距l2=0.25mm.
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质点沿x方向作简谐振动，其x-t曲线如图所示，则在ta和tb时刻，质点的振动速度 ( )
一个物体在x轴上作直线运动，位置随时间变化的关系为x=2+4t2(SI)，则t=2s时物体加速度大小为____________m/s2.
（ ）圆线圈l的半径为R1，圆线圈2的半径为R2=3R1，
如图，长直导线中载有恒定电流I，由半径为R的四分之一圆弧形导线和两段直导线围成的平面闭合回路以匀速v向上运动.已知闭合回路与长直导线共面，其OA边与长直导线平行，相距为R.求：
取一闭合积分回路L，使三根载流导线穿过它所围成的面。现改变三根导线之间的相互间隔，但不越出积分回路，则()
压强为p，体积为V，温度为T，质量一定的理想气体，其热力学能与( )
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在某地先后发生两事件，静止于该地的甲测得其时间间隔为.若乙以速度u相对于甲作匀速直线运动，则乙测得两事件的时间间隔为( )
用自然光和线偏振光构成的一束混合光垂直照射在一偏振片上，以光的传播方向为轴旋转偏振片时，发现透射光强的最大值为最小值的3倍，
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Passage Five An interesting project called Blue Zones is recording the lifestyle secrets of the communities with the highest, hest concentrations of centenarians in the worli.The people in the five regions in Europe, Latin America, Asia and the US that 1ive to be 100 have a lot going for them. Genes probably play a small role，but these folks also have strong social ties , tightly -knit families and lots of oppor tunities to exercise.As we were examining the dietary secrets of the Blue Zones, as described in author Dan Buettner" s latest book, The Blue Zones Solution, we were struck by how essential tea drinking is in these regions. In fact, Buettner’ s Blue Zones Beverage Rule- -a kind of guideline summarized from his 15 or so years of studying these places-- -is:" Drink coffee for breakfast, tea in the afternoon, wine at 5 p. tm^Science has plenty to say about the healthful virtues of green tea. Researchers are most enthusi- astic almt the components in green tea, as well as foods like c0coa. Why might they help so many 0kina vans in Japan break 1007 Some components in green tea can lower the risk of stroke, heart disease attd several cancers. 0ne review study also found that drinking green tea can slightly improve metabolism(新陈代谢).If you find yourself on the island of Ikaria, the Greek Blue Zone in the middle of the Aegean, you won' t be offered any tea made with tea leaves. Instead, Ikarians typically make their daily cup of tea writh just one fresh herb that they havepicked themselves that day -- ei ther rosemary, wild sage, oregano, nmxjotmn, mint or dandelion, all p1ants that may have anti-inflanmatory (消炎的) properties,which may help lower blood pressure. This could exp1ain Ikaria’s very low dementia (痴呆) rate, since high blood pressure is a risk factor for the disease.
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10._____you study,______you will become.
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惠特曼《草叶集》中的草叶是（ ）
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At the meeting place of the Yangtze River and the Jialing River______, one of the ten largest cities in ChinA.
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12．生产力范畴反映的是（ ）
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