深秋晴朗的夜晚,农民常用熏烟的方法来防止霜冻,主要原因是[ ] A、浓烟散射地面

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问题:

深秋晴朗的夜晚,农民常用熏烟的方法来防止霜冻,主要原因是[ ]

A、浓烟散射地面辐射,增加大气温度

B、浓烟反射大气逆辐射、增加大气温度

C、浓烟可阻挡冷锋前进,防止大面积作物冻害

D、浓烟吸收地面辐射,增加大气逆辐射

考点:大气的受热过程
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Elaine Wu is part of the first generation (代) of Chinese pianists. Born in Shanghai, she began practicing the piano at the    小题1:  of six when she was found to show a strong interest in classical music and the piano. One year later, she 小题2:  the first prize at a children’s piano competition in Shanghai.

小题3:  winning the prize, she went on to study under the    小题4: (著名的) Italian musician and piano educator Maestro Mario Paci. She had put all her energy into her music career in the    小题5: (过去) eighty years.

She put on performances at home 小题6:  abroad. In 1962, she was regarded    小题7:

the national first-class pianist.

In 1993, Wu was    小题8: (邀请) to teach piano in Singapore. She has been living 小题9: ever since. In August 2013, her    小题10: (第二) album (专辑), A Generation of Master 2, came out with full support from her fans.

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下列何组均是放射性核素()

A.1H和2H

B.1H和3H

C.2H和3H

D.1H、2H、3H

E.3H和32P

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当事人应如何查询自己的婚姻登记档案?

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放疗后多长时间内,照射野骨放射性浓聚增加()。

A.1小时~5天

B.10~15天

C.20~30天

D.45天~3个月

E.大于6个月

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声音在水中的传播速度约为()

A.340m/s

B.1500m/s

C.330m/s

D.1400m/s

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