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【单选题】
磁罗经的罗经首尾基线应与船的首尾面相________,否则罗经剩余自差增大。 98A.
平行
B.
重合
C.
交
D.
垂直
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举一反三
【简答题】已知一对 正常齿制 外啮合标准直齿圆柱齿轮的中心距 , , ,试计算这对齿轮的 模数和 分度圆直径、齿根圆直径及其齿顶圆直径。
【简答题】信息具有______、______、______、______、______、______、______、______、及______等特征。
【简答题】阅读理解。 Christmas was just a week away and I had five people left to shop for but only three dollars. 'Let's set a price limit on our gifts this year,'I suggested to my best friend Joanie. 'That's a goo...
【简答题】阅读理解。 Many Americans go to work five days a week. American students go to school five days a week, too. So they usually have a two-day weekend. The weekend is Saturday and Sunday. At the weekend, peop...
【单选题】We go to school . [ ]
A.
a week five days
B.
five days a week
C.
a day five weeks
D.
fives day a week
【简答题】数学具有______、______、______等特征。
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