皮皮学，免费搜题
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搜题
【判断题】
活塞环在自然状态下是一个封闭的圆环形A.
正确
B.
错误
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】I ______ several interesting facts about Mexico in that book.
A.
came to
B.
came into
C.
came over
D.
came across
【单选题】I was so angry that I came close to hitting her.
A.
visited
B.
came to see
C.
came next to
D.
almost hit
【单选题】I wonder how it ________ that they made such rapid progress.
A.
came about
B.
came out
C.
came on
D.
came up
【简答题】由皮肤衍生的结构是（）、（）、（）。
【单选题】I grandfather’s diary in the attic.A．came toB．came byC．came atD．came across
A.
I ____grandfather’s diary in the attic. A．came to
B.
came by
C.
came at
D.
came across
【简答题】皮肤由_________、_________、_________组成,其间含有_________、_________、_________、_________等结构,它们是由表皮衍生的皮肤附属器
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