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【单选题】
轴向直廓蜗杆又称ZA蜗杆,这种蜗杆在轴向平面内齿廓为直线,而在垂直轴线的于轴线的剖面内齿形是阿基米德螺线,所以又称( )蜗杆。
A.
渐开线
B.
双曲线
C.
阿基米德
D.
抛物线
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B.
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【单选题】A healthcare provider has two applications that they need to redundantly protect in a SAN environment. Their patient record application runs on Oracle 11i and consists of many small， randomly accessed...
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B.
Heavy drinkers make up about 11% of the drinking population.
C.
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D.
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【单选题】下列叙述中正确的是
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【单选题】According to the report, which of the following sentences is true?
A.
The only method of preventing the disease is to get flu vaccines.
B.
Dr. Morens was optimistic about the immediate future.
C.
As many as 87 percent of the 11,000 people who died from R. S. V. each year were 65 and older.
D.
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查看完整题目与答案
【多选题】角度测量分为( )。
A.
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B.
直角测量
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