焊药、焊芯和焊接材料在电弧高温作用下,熔化蒸发逸散至空气中,经氧化、凝聚而形成焊接气

题型:单项选择题

问题:

焊药、焊芯和焊接材料在电弧高温作用下,熔化蒸发逸散至空气中,经氧化、凝聚而形成焊接气溶胶,工人长期吸入这种气溶胶,就可能发生电焊工()

A.锰中毒

B.高血压

C.金属热

D.尘肺

考点:金属焊接操作金属焊接操作题库
题型:单项选择题

Crazy is our new normal. With two teenage boys and three little boys, our family is restless—to the baseball field, track field(田径场)and piano lessons. Even though we’ve limited each boy’s activities and try our best to defend our family time, it seems that we’re in a constant state of flight.

“Embrace it. Roll with it,” my husband, Lonny, says, “It’s going to be like this for a while.”

He is right. It’s likely that life will continue to go forward before it slows down. But I remembered the still, quiet days that our family used to enjoy. I missed long walks through the park when we held the boys’ little hands. I longed for(渴望) lazy Saturday afternoons under the tree in our backyard. I wanted to slip back a few years, when busyness was the exception and not the rule.

One night, after a particularly full day and evening games, our family gathered on the porch(门廊)for ice cream. Two parents, two teens, and three small boys piled on one old swing and a couple of rocking chairs. We were together, in one place, for a small slice of time.

The moon was full. The Mississippi River, flowing past our home, was smooth as glass. I wrapped my own arms around the son who sat on my lap and breathed deeply to inhale his little-boy scent(气味)—dirt and sweat. My heart was still and content(满足的).

I realized that while crazy is our new normal happiness is as usual. They may look different from before, but they are still there—even if they’re in the form of a single moment on the porch. Maybe I just need the eyes to see.

小题1:What does the author mainly talk about?

A.Her anger at her busy life.

B.Her family’s struggle for a better life.

C.Her new feelings about the present life.

D.The pleasure of staying with her children.小题2:How did the author feel about life before the night sitting on the porch with the family?

A.Confused.

B.Satisfied.

C.Bored.

D.Terrified.小题3:The underlined word “inhale” in the fifth paragraph probably means ______.

A.describe

B.breathe out

C.remove

D.breathe in小题4:Which of the following could describe the author’s present life?

A.Busy and boring.

B.Busy but happy.

C.Crazy and unbearable.

D.Normal but exciting.小题5:Which of the following statements might the author agree to?

A.Life is nothing but bitterness, busyness and horror.

B.Happiness is everywhere, but we have to discover it.

C.Parents should earn much money for their kids’ better life.

D.Life in the countryside is charming, wonderful, and sweet.

题型:单项选择题

现有一瓶某品牌的饮用纯净水。  

(1) 瓶中水喝光后,从瓶口向外吸气,瓶子变瘪,是由于瓶子受到                  的作用。

(2)用手握住水瓶在空中静止不动,此时水瓶受到的             和手对瓶的摩擦力是平衡力。   

题型:单项选择题

不是缩宫素特点的是()

A.能直接兴奋子宫平滑肌

B.对子宫体兴奋作用强

C.对子宫颈有松弛作用

D.对子宫作用敏感性不受女性激素的影响

E.大剂量引起子宫平滑肌强直性收缩

题型:单项选择题

先组式索引语言

题型:单项选择题

接地保护用零序分量原理构成,所谓零序分量就是()。

A.各相电流相等按顺时针顺序排列

B.各相电流相等按反时针顺序排列

C.各相电流大小相等方向相同

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