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【单选题】
以下关于按钮元件描述错误的是( )。A.
按钮元件是三种元件类型中的一种
B.
时间轴的第四帧定义了按的激活区域
C.
时间轴的每一帧都可以放置不同的图像或动画，响应不同的鼠标状态
D.
时间轴中最多只能放置四帧
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皮皮学刷刷变学霸
举一反三
【单选题】---- Would you like to go travelling with me to New York, Benjamin? ---- Sorry, I’m busy, for the final examination is coming. So I ____________ hard throughout the next several weeks.
A.
have worked
B.
have been working
C.
work
D.
will be working
【简答题】__________ [A] maintenance [B] protection [C] care [D] attention
【简答题】A．Pottery and car maintenance. B．Car maintenance and Spanish conversation. C．Folk guitar and Spanish conversation D．Spanish conversation and keep-fit.
【简答题】[A] management [B] maintenance [C] conservation [D] protection
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