云开题库
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BASIC是面向对象的程序设计语言。
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Barbara is calling a client she met at the car exhibition last Sunday.
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Barbara has made an appointment with Mr. Smith for this Saturday.
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Banks and travel services are reluctant to provide traveler's checks.
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Baidu, Lenovo, Xiaomi have all announced their own smart watch.
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Bai Mei enrolled at the Law School last week.
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background设置页面背景颜色
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background-size属性值可以是contain，表示等比缩放，但以短边刚好缩放到与元素对应边等长时，停止缩放。（）
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B747M代表的是B747M
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B747F代表的是B747系列窄体飞机
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