预制梁运输时叠放不宜超过()层。 A.2 B.3 C.4 D.5

题型:单项选择题

问题:

预制梁运输时叠放不宜超过()层。

A.2

B.3

C.4

D.5

考点:二建公路专业继续教育二建公路专业继续教育题库
题型:单项选择题
在自来水生产过程中,不涉及化学变化的是(  )

A.杀菌消毒

B.过滤水中的泥沙

C.调节水的pH

D.沉淀水中的Ca2+和Mg2+

题型:单项选择题

阅读理解。

     Studying for an exam while listening to music is not smart, because background music can injure

your ability to perform memory tasks, new research has found.

     Study participants were asked to recall a list of eight consonants (辅音字母) in the order they

were presented. They did this while in five different sound environments: quiet surroundings; music

they liked music they disliked; changing state; and steady state.

     The participants recall ability was poorest when listening to music, regardless of whether

they liked or disliked it, and in changing-state conditions. The most accurate recall occurred

     when participants performed the task in steady-state environments, according to the study

published online in the journal Applied Cognitive Psychology.

     The poorer performance of the music and changing-state sounds are due to the audible (听得

见的) change within those environments. This hurts the ability to recall the order of items, via retelling,

within the presented list, explained lead researcher Nick Perham, a lecturer in the School of Psychology

at the University of Wales Institute in Cardiff, in a news release from the journal's publisher.

      "Mental arithmetic (算术) also requires the ability to memorize order information in the short-term

via retelling, and may be similarly affected by their performance in the presence of changing-state,

background environments," he added.

1 When performing a challenging mental task, you'd better do it ______.

A. in the music you like                

B. in the music you dislike

C. in changing state                    

D. in steady state

2. The reason why the participants performed poorly while listening to music is that ______.

A. the music was too loud

B. they got lost in the music

C. the changeable sound disturb the input of the information

D. they couldn't focus their attention

3. Which of the following is in steady state?

A. 12345.        

B. 33333.

C. abcde.          

D. a1b2c.

4. We can learn from the text that ______.

A. When doing our homework, we'd better play sweet songs

B. Music may affect our performance of memorizing

C. Mental arithmetic means retelling the order of information

D. Reading in the noisy street can strengthen our ability of concentrating

题型:单项选择题

在治安管理处罚中,对于数种违反治安管理行为的处罚,按照“分别裁决,合并执行”的原则,拘留期限可以超过( )。

A.10日

B.15日

C.30日

D.60日

题型:单项选择题

引发黄自创作《长恨歌》的动机。

题型:单项选择题

调查主责任人不按照有关制度规定进行调查,误导审查和审批,造成损失的,一律撤职。

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