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【简答题】
拉伸性能试验一共分为四个阶段,第I阶段为_____阶段。
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
【简答题】购买力平价(purchasing-power parity)
【单选题】_____ the earth to be flat, many feared that Columbus would fall off the edge of the earth. [ ]
A.
Having believed
B.
Believing
C.
Believed
D.
Being believed
【单选题】______ the earth to be flat, people feared that Columbus would fall off the edge of the earth.
A.
Having believed
B.
To believe
C.
Believing
D.
Believed
【单选题】_________ the earth to be flat, many feared that Columbus would fall off the edge of the earth.
A.
Having believed
B.
Believed
C.
Believing
D.
Being believed
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