TB/T2340—2000标准规定,37°和70°探头探测WGT-3试块上φ3×65

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问题:

TB/T2340—2000标准规定,37°和70°探头探测WGT-3试块上φ3×65横通孔,当波高达到80%时的灵敏度余量不小于()。

A、46dB

B、42dB

C、36dB

D、40dB

考点:钢轨探伤工考试中级钢轨探伤工中级钢轨探伤工题库
题型:单项选择题

首字母填空。

     For a long time, Hawii has been a magic name to people who like to t __1__. People on b __2__ sides

  of the Pacific Ocean i __3__ . Their dreams a __4__ include at least one scence of a sunset and it drops

 a glow that lights the skies in quiet o __5__ water.

    The beauty of the islands greeted the first strangers , Polynesian people, who came here in canoes.

    They found the beautiful white sand beaches and the waving palm b __6__ trees, but t __7__ were no

 giant hotel  l __8__ the ones we see nowadays . The first people came to Hawaii n __9__ 200 years

 ago,  but skyscraper (very tall building) hotels have only been built in the l __10__25 years.

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有机磷中毒死亡的主要原因

A.心衰

B.肾衰

C.中枢抑制

D.呼吸衰竭

E.血压下降

题型:单项选择题

在我国建设社会主义市场经济过程中,(    )是主体,(    )是国民经济的支柱,在国民经济中起(    )作用。

A.国有经济公有制主体

B.公有制国有经济主导

C.股份制公有制主导

D.公有制国有经济主体

题型:单项选择题

衡阳单体泵系统在运行过程中出现下列故障不会产生故障码的是()

A.中冷器泄露

B.单体泵电磁阀损坏

C.水箱开锅

D.油门踏板损坏

题型:单项选择题

计算机网络系统由两个子网构成,它们是()。

A.有线网和无线网

B.通信子网和资源子网

C.数据子网和通信子网

D.点对点网和广播式网

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