螺栓联接时,由于联接件支承面的偏斜很容易会使螺杆产生附加的()应力,降低螺栓强度。A

题型:单项选择题

问题:

螺栓联接时,由于联接件支承面的偏斜很容易会使螺杆产生附加的()应力,降低螺栓强度。

A、弯曲

B、拉伸

C、横向

D、剪切

考点:化工检修钳工化工检修钳工初级化工检修钳工初级题库
题型:单项选择题

女性,20岁。高热伴左侧胸痛1周,经检查诊断为结核性胸膜炎。关于加用激素的先决条件应是()。

A.大量胸水

B.伴有其他浆膜炎

C.高热不退

D.抗结核药物治疗

E.咯血较多

题型:单项选择题

阅读理解

Picking tomatoes

     For as long as I can remember,Grandma's plentiful tomato garden has been a sign of summer's end.

Each September,just as the decreased heat of the sun suggests cooler days,Grandma requests my help in

her tomato garden.She convinces me she cannot pick tomatoes without my youthful eyes and quick mind.

She says we need to examine each tomato and agree on its readiness for picking.While Grandma's

request for my help in the tomato garden is always the same,her desire for my help seems to increase each year.

     Grandma has eyes for finding even the tomatoes hidden by undergrowth and other tomatoes.I,however,just turn circles looking for the ones I think Grandma will like.I spot what looks like a ripe tomato,head in

its direction,and then get sidetracked by another that appears to be equally ripe.I usually end up watching Grandma and trying to stay out of her way,which seems the only way my eyes and mind are useful.

     There we are,lost in the tomato vines(藤). Grandma's eyes are always knowing,and they are no

different in the vegetable garden.From afar she spots what looks like a ripe tomato.As she walks toward

the garden,she evaluates the tomato for a second time,but from a different angle.I already know it will end up in the basket with the pile of others Grandma has carefully chosen.However,Grandma acts as if she

needs final look to be sure.She calls me to her side,kneels beside the vine while enjoying the warmth of the fading sunlight on her face,and grasps the tomato in her hand.She turns each round,red ball toward the

sunlight before disconnecting it from the vine with a halfhearted smile.

     She then looks at me.I nod my head and smile.Grandma assumes I smile in agreement with her tomato selection.I know I smile,instead,at her.

1. Why does Grandma ask the author to go to the tomato garden with her?

A. He can help pick more tomatoes.

B. He can learn the hardship of labor.

C. She enjoys staying with him while working.

D. She tries to share the happiness of harvest with him.

2. The second paragraph shows that the author ________.

A. is an inefficient tomato picker

B. really has youthful eyes and quick mind

C. has spent a lot of time gardening with Grandma

D. is a naughty child trying to be out of Grandma's sight

3. In the last paragraph,the author smiles to Grandma because he ________.

A. realized her true intentions

B. felt very happy to pick potatoes for her

C. confirmed that her choice of tomato is great

D. appreciated her skill in finding ripe tomatoes

4. What can we infer from the story?

A. The grandchild will become more skillful at gardening than Grandma.

B. Grandma will develop more patience in working with the grandchild.

C. The grandchild will gradually become more independent of Grandma.

D. Grandma's need for the grandchild's company will grow over time.

题型:单项选择题

站在经营者角度,人们常常把卖方称之为_______________,而将买方称之为市场。

题型:单项选择题

下列关于正常人血液在血管内不凝固的原因叙述错误的是

A.血管内膜光滑完整

B.凝血酶原无活性

C.有抗凝物质存在

D.纤维蛋白溶解系统

E.血流速度慢

题型:单项选择题

无功功率变送器将被测无功功率转换成按相性比例输出()。

A.直流电流

B.交流电压

C.电磁电流

D.交流电流

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