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【单选题】
下列关于三针法测量的说法,正确的是. A.三针法属于直接测量 B.三针法的量针直径根据螺距选择 C.三针法测量内外螺纹中径 D.数据处理是取平均值A.
B.
C.
D.
D
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【简答题】Section B – TWO questions ONLY to be attempted Thebe Telecom is a large national telephone business in Fayland. Thebe provides telephone service to more than 11 million customers through its fixed lin...
【简答题】已知集合A={-1，0}，集合B={0，1，x+2}，且A?B，则实数x的值为______．
【简答题】已知集合A={x|ax 2 -4x+2=0}有且只有一个元素，则实数a的取值集合为______．
【简答题】National parks are large of areas of public land . They give a safe home for local plants and animal . They help keep the air and water clean . They also give us the best trips . Today ,there are near...
【单选题】The national park has a large collection of wildlife, _________ from butterflies to elephants.
A.
ranging
B.
range
C.
to range
D.
ranged
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