题目内容
变压器在运行中，只要（ ）和（ ）不变，其工作主磁通Φ将基本维持不变。
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3. Shao Qiwen, director of Chin's National Tourism Administration predicts that China's tourism business will be worth a staggering $128 billion this year, much of that coming from 20 estimated 15 billion domestic travelers.
4. Lily Liu, one of the organizers of last November's first-ever China Luxury Travel Fair in Shanghai, which brought high-end hoteliers and tony travel providers together with prospective clients.
5. Outside Beijing's Sixth Ring Road, far from the turbulent urban sprawl of China's capital, I Spa provides an oasis of comfort and indulgence, centered on a series of foiling pools of mineral-rich water.
当电源电压一定时，只要改变两线圈的匝数比，就可得到不同的输出电压。
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