从广义上讲,不属于陶瓷的是()。A、红砖 B、铁氧体磁铁 C、煤碴砖 D、耐火砖

题型:单项选择题

问题:

从广义上讲,不属于陶瓷的是()。

A、红砖

B、铁氧体磁铁

C、煤碴砖

D、耐火砖

考点:助理营销师(三级)助理营销师(三级)题库
题型:单项选择题
已知一组数据x1,x2,x3,…,xn的平均数是
.
x
,方差是S2,设另一组数据x′1=ax1+b,x′2=ax2+b,x′3=ax3+b,…,x′n=axn+b的平均数是
.
x
′,方差是S′2.请说明以下等式成立的理由:
(1)
.
x
′=a
.
x
+b;(2)S′2=a2S2
题型:单项选择题

在解方程3x+5=﹣2x﹣1的过程中,移项正确的是 [ ]

A.3x﹣2x=﹣1+5

B.﹣3x﹣2x=5﹣1

C.3x+2x=﹣1﹣5

D.﹣3x﹣2x=﹣1﹣5

题型:单项选择题

Last winter, when I was heavily pregnant, I was visiting my sister and brother-in-law's house and had to park in a nearby parking lot because they didn't have accessible parking. The snow was extremely heavy and there was lots of ice on the ground --- not many people had ventured out that evening!

When I returned to my car around 11pm, I noticed that I was the only car left. Nervously, I hopped into the car and let it warm up a bit. When I finally tried to drive away, my wheels began to spin. I was stuck! I spun and spun and wondered what to do.

All of a sudden, in my rear view mirror, I saw four teen-aged boys approaching my car. They were walking side by side in a line and dressed a bit like gang members --- at least I thought that's what they looked like. My car was in a very isolated area and I began to panic. I was certain they were coming to my car to harm me. Terrified, I just froze. One of the young men tapped on my window and said "Excuse me, Ma'am, can we help you? You seem stuck." Still afraid and fearing the worst, I said "I am stuck." And the young man said "It's okay, stay in your car and we'll push you out of the snow." And they did!

When they finally got me out of the snow, they smiled and waved. I rolled down my window and thanked them, embarrassed to have judged them so poorly.

小题1:Why did the author just freeze when the four young men walking toward her car?

A.Because she was afraid of being harmed.

B.Because she sat in her car for too long a time.

C.Because she was cold indeed in that freezing evening.

D.Because she knew they would rob her of the car.小题2:Which of the following words can best describe the four young men?

A.Impolite.

B.Ill-mannered.

C.Unfriendly

D.Warm-hearted.小题3:Which of the following is true according to the text?

A.One of the four teenagers was a gang member.

B.The kids wanted to help the author out of trouble.

C.The author would have a baby in her car.

D.The young men enjoyed pushing cars out of the snow.小题4:The best title for the text would be___________.

A.Every man has his faults

B.Fortune favors those who use their judgment

C.Don't judge a book by its cover

D.Think twice before you do.

题型:单项选择题

作业层上的施工荷载应符合设计要求,不得超载,不得在脚手架上集中堆放()、钢筋等物料

题型:单项选择题

常用来保护可燃气体储罐的自动喷水系统是()。

A、水喷雾灭火系统

B、干式系统

C、预作用系统

D、水幕系统

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