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    On April 26, China's first homemade aircraft carrier(航空母舰) hit the water in Dalian, Liaoning. It is China's second aircraft carrier and it has no name yet. It was designed in China.

    It is about 315 meters long and 75 meters wide. It is a bit larger than three soccer fields. It can carry 40 to 50 planes.It is the largest and best ship China has ever built.

    An aircraft carrier is like an airport on the sea. It can carry hundreds of planes. Planes fly from and land back on it, and soldiers work and live on it. It is expensive to build an aircraft carrier. It costs a lot of money and uses a lot of steel. It also uses technologies. Finally, it takes years to build.

    Today, not many countries own an aircraft carrier or have the ability to build one. When the new carrier is finished, China will become the seventh country in the world that can build an aircraft carrier by itself, after the US, Russia, UK, France, Italy and Spain.

①橘皮在石灰水中浸泡时间为10小时以上

②橘皮要浸透，压榨时才不会滑脱

③压榨液的黏稠度要高，从而提高出油率

④压榨时加入0.25%的小苏打和5%的硫酸钠

磁通量可以形象地理解为“穿过磁场中某一面积的磁感线条数”．在右图所示磁场中，$s_1$、$s_2$、$s_3$为三个面积相同的相互平行的线圈，穿过$s_1$、$s_2$、$s_3$的磁通量分别为${\phi }_1$、${\phi }_2$、${\phi }_3$且都不为0．下列判断正确的是   （   ）

材料一：英国《泰晤士报》记载：“据估计，被劫掠和破坏的财产，总值超过六百万磅。在场的每个军人都掠夺了很多。在进入皇宫的宫殿后，谁也不知道该拿什么东西。为了拿金子，而把银子弄丢了，为了拿鑲有珠玉的饰品和宝石，又把金子丢了，无价的瓷器和珐琅器，因为太大不能运走，竟被打碎。”

材料二：“俄国采取表面‘调停’实际支持的态度。在战争中，不花费一文钱，不出动一兵一卒，而能比任何一个参战国得到更多的好处。”

——马克思

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