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【单选题】
关于自位支承,下列说法错误的是 。A.
在定位过程中自位支承的位置是随着定位基准面位置的变化而 变化 的。
B.
每一个自位支承 只能限制一个自由度，即只起一个定位支承点的作用。
C.
每一个自位支承与工件有且仅一点接触。
D.
在夹具设计中，为使工件支承稳定，或为避免过定位，常采用自位支承。
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皮皮学刷刷变学霸
举一反三
【单选题】What important role did the diary really play?
A.
It corrected injustice.
B.
It was as vivid as the movie 'Titanic'.
C.
It proved what Masabumix said was tree.
D.
It made the Japanese believe what Masabumix had said
【单选题】What important role did the diary really play?
A.
It corrected injustice.
B.
It was as vivid as the movie 'Titanic'.
C.
It proved what Masahumi said was true.
D.
It made the Japanese believe what Masabumi had said
【简答题】简述西周时期的土地所有制。
【单选题】What important role did the diary really play?
A.
It corrected injustice.
B.
It was as vivid as the movie 'Titanic'.
C.
It proved what Masabumix said was true.
D.
It made the Japanese believe what Masabumix had said.
【单选题】What important role did the diary really play?
A.
It corrected injustice.
B.
It was as vivid as the movie 'Titanic'.
C.
It proved what Masabumi said was true.
D.
It made the Japanese believe what Masabumi had said.
【简答题】心室肌细胞动作电位可分为______期、______期、______期、______期和______期等5个时期。
【单选题】窦房结细胞的动作电位
A.
0期去极化速度快
B.
动作电位与心室肌细胞一样也分为5个时期
C.
4期可产生自动去极化
D.
4期膜电位较平稳
E.
最大舒张电位和阈电位的绝对值大于浦肯野细胞
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