钝边的作用是防止接头根部焊穿。

题型:判断题

问题:

钝边的作用是防止接头根部焊穿。

考点:初级电焊工考试初级电焊工考试题库
题型:判断题

我国粮食产量逐年提高,出现供过于求的状况,国家以保护价敞开收购农民余粮。这说明[ ]

A、国家对市场价格进行宏观调控

B、农业部门不应当市场化

C、只有计划定价才能保证物价稳定

D、国家主要通过行政手段干预经济

题型:判断题

It was a Sunday and the heavy storm had lasted all night. The morning after the storm, though, was beautiful: blue skies, warm air and a calm, inviting sea touching the shore gently.

My father realized it was a good day for fishing and invited my sister and me to go with him. I was only 14 and fishing had never been my thing, but I decided to go all the same. I’m so glad I did.

On the road to the harbour we could see the terrible destruction on the coast, but the harbour itself was in fairly good shape. After all, it was protected by the arms of a bay that had only one tiny channel to the sea. As we got on board, we noticed two big humps(脊背) in the distance.

On approaching them, we saw it was a mother whale with her baby. We couldn’t believe it ——there aren’t any whales along the coast here. The storm must have driven them across the ocean into the bay, in which the still water was so badly polluted that nothing could survive.

The little baby whale——actually as big as our boat——was obviously stuck and could not move. The mother dived under the water and came up suddenly, making big whirlpools(漩涡) and waves. ”She’s trying to help her baby, but on the wrong side, ”my father said. At this point, my father moved our boat in a semicircle to the other side and, heading the boat towards the baby whale, pushed it gently. With our several gentle pushes the big hump turned over and disappeared under water. Then it swam up right beside its mum. They struggled in their desperate attempts to escape but missed the exit and started heading in the wrong direction. We hurried up to the whales and tried to lead them towards the bay channel. Slowly, they let us lead them, some-times rising from the water right beside us to breathe——and to give us a trusting look with those huge eyes. Once they hit their first part of clean water flowing straight from the sea, the mum gave us a wave with her tail and off they swam into the distance.

In the excitement it had felt like only a few minutes, but we had been with those wonderful animals for almost an hour and a half. That was the simple and lasting beauty of the day, Nearly four decades later, I still look back fondly to that golden day at sea.     

小题1:The author says “I’m so glad I did ” (in Para. 2)because ______.

A.he witnessed the whole process of fishing

B.he enjoyed the beauty of the calm sea

C.he experienced the rescue of the whales

D.he spent the weekend with his family小题2:The harbour survived the storm owing to____________.

A.the shape of the harbour

B.the arms of the bay

C.the still water in the channel

D.the long coast line小题3:The mother whale failed to help her baby because__________.

A.she had stayed in the polluted water for too long

B.the whirlpools she had made were not big enough

C.she had no other whales around to turn to for help

D.the waves pushed her baby in the wrong direction小题4:what is the theme of the story?

A.Saving lives brings people a sense of happiness

B.Fishing provides excitement for children

C.It’s necessary to live in harmony with animals

D.It’s vital to protect the environment

题型:判断题

表示汽油安定性的指标,一是胶质含量,另一个是()期。

题型:判断题

某城市道路改造工程,随路施工的综合管线有0.4MPa的DN500中压燃气、DN1000给水管并排铺设在道路下,燃气管道与给水管材均为钢管,实施双管合槽施工。热力隧道工程采用暗挖工艺施工。承包方A公司将工程的其中一段热力隧道工程分包给B公司,并签了分包合同。
1.B公司发现土层松散,有不稳定迹象,但认为根据已有经验和这个土层的段落较短,出于省事省钱的动机,不仅没有进行超前注浆加固等加固措施,反而加大了开挖的循环进尺,试图“速战速决,冲过去”,丝毫未理睬承包方A公司派驻B方现场监督检查人员的劝阻。结果发生隧道塌方事故,造成了3人死亡。
2.事故调查组在核查B公司施工资格和安全生产保证体系时发现,B公司根本不具备安全施工条件。

对发生的安全事故,A公司在哪些方面有责任

题型:判断题

()主要用于测量电压波形的正弦畸变率情况。

A、万用表

B、交/直流钳型表

C、杂音计

D、示波器

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