铣削

题型:名词解释

问题:

铣削

考点:机械工程机械设计基础机械设计基础题库
题型:名词解释
下面计算正确的是(  )
A.x2•x3=x6B.1÷ 
5
3
 × 
5
3
=1
C.-32=9D.
1
|-3|
1
(-3)
题型:名词解释

首字母填空  (本大题共5分,每小题0.5分)

In Beijing Sunshine Secondary School, every student has locker. What do they have in t__________1 lockers? Lily has some a_________2 and pears in hers. Behind the pears, there is some b______3. She a________4 has a pair of glasses in her locker. What about Millie? What does she have in her locker? She has a t_______5 bear in it. On the right of the bear a_____6 some CDs and hair clips.

Boys have many things in their lockers too. Nick has a b__________7 in his locker. He also has some c_______8 books. Peter has bats in h_____9. There are some bottles of w________10 beside them. The boys also have their sports shoes in their lockers.

题型:名词解释

我们把一分钟内呼吸的次数称为呼吸频率,呼吸一次所用的时间称为呼吸周期,下图中能正确反映呼吸频率与呼吸周期关系的是(  )

A.

B.

C.

D.

题型:名词解释

我省的祁门红茶是“世界四大红茶”之一,由于香叶醇(C10H18O)的含量高于普通茶叶的几十倍,因而具有独特的玫瑰花香。下列关于香叶醇的说法错误的是

A.由C、H、O三种元素组成      B.闻到玫瑰花香说明分子在不断运动

C.该物质不是氧化物             D.组成元素中,氢元素的质量分数最大

题型:名词解释

对发生振动压力钢管采取哪些有效措施消除振动?

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