皮皮学，免费搜题
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搜题
【单选题】
卷轴展开的动画,底图使用的进入效果是()A.
劈裂
B.
擦除
C.
浮动
D.
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拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Radiant energy is stored as carbon compounds by ______.
A.
plants
B.
rain
C.
coal, oil, and natural gas
D.
inflammable substances
【单选题】( ) 主要用于圆桶、管道、容器、油罐车和油槽车等外部因内外作用出现裂缝、漏洞时的快速有效堵漏
A.
内封式堵漏袋
B.
木质堵漏楔
C.
外封式堵漏袋
D.
捆绑式堵漏袋
【单选题】Steel, coal and oil are to industry ______ food is to man.
A.
that
B.
so
C.
and
D.
as
【单选题】The trouble with such resources as coal, oil and gas ______ that they are not renewable.
A.
was
B.
are
C.
have been
D.
is
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