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下列不是document对象的属性的是()
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阅读下面的JavaScript代码输出结果是（）。functionf(y){varx=y*y;returnx;}for(varx=0;x<5;x++){y=f(x);document.writeln(y);}
Complete the following passage with key information from the text.In his 2003 speech at Rice University’s Energy & Nanotechnology Conference, the late Nobel Laureate Richard Smalley highlighted the 10 problems for the next 50 years. In his list, sits at the top, and water comes next. Now, with the price of solar power going down, the dawn of a new energy is just around the corner. As a result, is going to be the greatest challenge for humanity.But the water problem is . First, unlike coal and oil, water cannot be .Second, water is with every other sector of society. Third, while water demands are growing, climate change is intensifying droughts and floods and water supplies are .There are solutions, such as building water-transfer aqueducts, hydroelectric dams, and desalination plants. But they may be incredibly . It willfor scientists to find affordable solutions to the water problem. Before that, everyone should do his or her bit to water.
对于无产道障碍而宫缩无力的孕妇催产宜用
麦角新碱禁用于催产和引产的原因是
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