《工业企业厂界环境噪声排放标准》(GB12523-2011)中根据被测声源的声级起伏

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问题:

《工业企业厂界环境噪声排放标准》(GB12523-2011)中根据被测声源的声级起伏幅度将噪声分为了稳态噪声和非稳态噪声,下列属于稳态噪声的有()

A.1dB

B.2dB

C.3dB

D.4dB

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补全对话

根据对话内容,, 从对话后的选项中选出能填入空白处的最佳选项.选项中有两项多余选项.

— Hello,  Tom, glad you're back. We all missed you.

— Oh, hello,Edith, I missed you too.__1__

— Fine, thanks. I've been working on the summer paper over the past two weeks, and now it's nearly finished.__2__

— Yes,  I was in Italy for two months.

— How did you manage it? I thought you were only going to stay for a few weeks.

— __3__But it was easy. You see, I got a job.

— A job? What did you do?

— __4_

— But you're not a teacher.

— I told Tony I couldn't teach, but he insisted on having a talk with me in English three times a week.

— Did your pupil learn much English?

— __5__

A. I gave English lessons to a tailor. His name's Tony.

B. How are you?

C. Have you ever been to Italy?

D. Yes,, I suppose I should have done so.

E. I heard you went to Italy?

F. I don't know,, but I learned a lot of Italian.

G. I hadn't expected to stay there so long either.

题型:多项选择题

读图,完成下列问题。(5分)

(1)与中国地图相比,北京市地图的比例尺较      ,表示的内容较      

(2)在中国地图上量得北京到广州的直线距离为2.4厘米,两地的实地距离约为        千米。

(3)两图中北京到广州、北京到天津的图上距离接近,但实际距离较远的是北京到           。

(4)依据地图信息,判断北京在天津的方位是      

题型:多项选择题

《我这一辈子》是由著名表演艺术家()自编自导自演的一部优秀影片。

A、赵丹

B、袁牧之

C、石挥

D、蓝马

题型:多项选择题

如图所示的用具中,属于省力杠杆的是

题型:多项选择题

地层倾角测井仪的基本工作原理是什么?

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