皮皮学，免费搜题
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【单选题】
禁止安全标志 表示 的是 ( ) ?A.
禁止启动
B.
禁止转动
C.
禁止触摸
D.
注意安全
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】---- Mary, could you come to our art club on Sunday. ---- __________.
A.
Sure, I'd love to
B.
Never mind
C.
You're welcome
D.
I'm sorry to hear that
【简答题】A．More than 9,000 yuan. B．Yes, it's very expensive. C．Only three computers. D．No, it's cheap.
【简答题】A．10,000 pounds per year. B．It's very expensive. C．Nothing, it's free. D．2 pounds per day.
【简答题】A．It's very expensive, B．It's quite cheap. C．It's perfect in service. D．It has a fancy environment.
【简答题】在光线作用下能使物体表面有 的现象称为外光电效应,基于外光电效应的光电元件有 、光电倍 增管等。
【简答题】A．It's very expensive. B．It hasn't proven to be totally effective. C．It can be damaging to some books. D．It can't be used on books published before 1850.
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