超声波的声能被缺陷的不规则表面反射和散射,到达接收探头的声能减少,反映为()。

题型:填空题

问题:

超声波的声能被缺陷的不规则表面反射和散射,到达接收探头的声能减少,反映为()。

考点:试验检测员构造物基础构造物基础题库
题型:填空题
It was Saturday yesterday. When Mrs Black      the door and looked        , she smiled and said, "It's going to        a beautiful day." She woke her small son up at eight thirty and said to him, "Get up, Tod. We are going to the zoo       . Wash your hands and face, brush your teeth and eat your breakfast quickly.   Tod was six years old. He was very happy       he liked going to the zoo very much. He said, "I dreamed I was        the zoo last night, Mummy."
His mother was      , but she stopped and smiled at      , "      did you do in the zoo in your dream?" Tod laughed and answered, "You know, Mummy. You      in my dream, too."
小题1:
A.opensB.is openingC.openD.opened
小题2:
A.outB.inC.atD.for
小题3:
A.doB.haveC.beD.make
小题4:
A.yesterday B.tomorrowC.todayD.last week
小题5:
A.whenB.becauseC.soD.why
小题6:
A.withB.aboutC.forD.in
小题7:
A.freeB.happyC.goodD.busy
小题8:
A.her coatB.her husbandC.her sonD.the bed
小题9:
A.WhatB.WhereC.HowD.Why
小题10:
A.are thereB.were thereC.are here D.were here
题型:填空题
已知菱形ABCD的边长为2,∠DAB=60°,E、F分别为CD,BC的中点,则
AF
BE
=______.
题型:填空题

用黑盒技术测试用例的方法之一为( )。

A.因果图

B.逻辑覆盖

C.循环覆盖

D.基本路径测试

题型:填空题

离心泵结构形式按轴的()可分卧式和立式。

A、长度

B、位置

C、高度

题型:填空题

卫生统计工作的基本步骤中,分析资料就是()

A.确定观察单位

B.确定观察指标的数量

C.研究观察指标的性质

D.规定资料的类型

E.计算分析并作出结论

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