皮皮学，免费搜题
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搜题
【判断题】
定义盒模型外填充时可以使用负值。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
【多选题】Which of the following statements is/are correct about the sentence below? After he had returned to his house, he was reading a book.
A.
去掉was
B.
去掉reading
C.
was reading改为过去式read
D.
had returned没有错
【单选题】He was reading his book, completely ______ to the world.
A.
lost
B.
losing
C.
to lose
D.
to having lost
【单选题】He was reading his book, completely_______ to the world.
A.
lost
B.
losing
C.
to lose
D.
to have lost
【简答题】什么是金属材料的力学性能,主要包括哪些方面?(各力学性能定义)
【简答题】材料研究的核心任务是尽快获取目标材料,当下主要采用___法来实现。
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