皮皮学,免费搜题
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【单选题】
用皮托管来测量气体流速时,其测出来的流速是指
A.
气体的平均流速
B.
气体的最大流速
C.
皮托管头部所处位置上气体的点速度
D.
皮托管头部所处位置上气体的点速度
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【简答题】阅读理解 This is our classroom.  It's a nice big room.  The windows are big and the walls (墙) are white.  There is a map of China on the back (后面的) wall. There is a big desk.  It's for the teacher.  There...
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A.
help people see things quickly.
B.
make a place feel more friendly.
C.
can make people nervous.
D.
make people feel bored.
E.
can help people pay attention.
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A.
旅行社负责人
B.
政府派出机构
C.
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D.
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A.
社会主义代替资本主义是人类社会的必然规律
B.
在不同国家建立的无产阶级专政,其本质都是一样的
C.
社会主义民主和无产阶级专政必然具有民族特色
D.
无产阶级专政在不同的国家有不同的形式
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