含碳量在()%以下的铁碳合金称为碳素钢。A、21.1 B、2.11 C、0.21

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问题:

含碳量在()%以下的铁碳合金称为碳素钢。

A、21.1

B、2.11

C、0.21

考点:冲压工考试高级冲压工高级冲压工题库
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汽轮机油封环有什么作用?

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如图所示,带电粒子以速度v刚刚进入磁感应强度为B的磁场,下列各图所标的带电粒子+q所受洛伦兹力F的方向中,正确的是(  )

A.

B.

C.

D.

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安全阀一般至少每年检验一次,检验内容包括:清洗、研磨、零件更换、定压和气密试验。安全阀的定压值不得随意变更,其值最大不得超过容器的设计压力。69

题型:单项选择题

B


It keeps your insides from falling out. It helps you warm up when you are cold, and it can cool you off when you are hot. It lets you feel things by touch.
What is this Your skin, of course! What does your skin ask for in return for all the wonderful things it does Just a little care! So let’s learn how to take good care of our skin.
Like the heart and stomach, your skin is an organ(器官). In fact, it is the largest organ in your body. Unless there’s a problem, you may not think about your skin very much. But skin has an important job to do.
Your skin is protecting you. Your skin keeps you from getting sick. When you take care of your skin, you are helping your skin do its job. Taking care of your skin today will help you have no problems in the future.
Clean skin is happy skin! One simple way to take care of your skin is to keep it clean. Keeping your hands clean is very important. When washing your hands, use warm water. Wet your hands, and then use soap. You should wash your hands carefully everywhere.
You’ll also want to use warm water, but not too hot, when you take a bath. Use soap to clean your body. Don’t forget under your arms and behind your ears! Your face needs attention, too. It’s a good idea to wash your face once or twice a day with warm water.

We can infer(推断)from Paragraph 3 that ______.

A.people don’t often care much about their skin

B.skin is an organ

C.there would be nothing wrong with your skin

D.skin is not important at all

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双桅杆抬吊塔类设备时,如采用可回转矩形断面桅杆,考虑设备的最外缘和桅杆间的间隙裕量时,计及桅杆旋转对角线尺度吗?

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