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    Michael Jackson was one of the world's best singers. He was born in the middle west of the city of Gary, Indiana, in 1958. He began singing with his four brothers. They called the group, “The Jackson Five”. The group became very popular after appearing on a television program. In 1970 the group made their  first record with the name of I Want You Back. It was very popular. One of their hit records was Never Say Goodbye.

    Michael was good at dancing as well as singing, for example, his dance moves and moon walking. He was asked to act in a film in 1978 for the first time, and in the same year he made a record on his own, which was sold eight million copies all over the world.

    Michael nearly didn't go out because he was too famous. Once his fans went off in a faint(晕倒)when they saw him at the concert. No one can do it by now. He lived in a large house and kept lots of animals. He never ate meat. He often raised money for charity. This made him win the Guinness world Records(吉尼斯世界纪录)in 2006. He died on June 25th, 2009, but he would live in our hearts forever.

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我国瓦良格号航母于2012年1月8日进行了第四次出海试航并顺利返航.瓦良格号航母的满载排水量为67500t,4台蒸汽轮机共提供约1.5×105kW的动力,最大航速30节(1节=1海里/小时),航母上安装有卫星通讯天线、有源相控阵雷达等设备,配备近防武器系统和各型舰载机.

(1)航母上的雷达发现敌方的军事目标,是利用了____ (选填“电磁波”或“超声波”),它____ (填“能”或“不能”)在真空中传播.

(2)蒸汽轮机利用重油(原油提取汽油、柴油后的剩余重质油)做燃料,通过锅炉把水加热成蒸汽,由蒸汽推动蒸汽轮机转动.重油是____ (选填“可再生”或“不可再生”)能源;蒸汽轮机工作时将燃料燃烧获得的____ 能转化为机械能.

(3)该航母满载行驶受到的浮力____ N.若航母以最大航速航行100海里,消耗120t重油,则行驶时间为____ h;完全燃烧120t重油可产生____ J的热量,4台蒸汽轮机的效率约为____ .(重油的热值q=4×107J/kg,g取10N/kg)

(4)某舰载机在静止的航母上,通过弹射装置获得一定的初速度后,在水平跑道上以6×106W的恒定功率沿直线加速,行驶过程中所受阻力不变,运动的速度v与时间t的关系如图甲所示,飞机运动过程中受到的阻力是____ N.舰载机机翼的横截面设计成如图乙所示的形状,是利用了在气体中流速越大的地方压强越____ 的原理,为飞机提供升力.为了获得更大的升力,飞机起飞时应让飞机____ (选填“逆风”或“顺风”)起飞.