2012年1月27日广西龙江河镉超标,严重威胁着下游民众的饮水安全。为处理镉污染

题型:选择题

问题:

2012年1月27日广西龙江河镉超标,严重威胁着下游民众的饮水安全。为处理镉污染,当地政府组织人员在镉超标水域投放了大量烧碱或石灰,以及氯化铝,絮凝沉降镉离子,避免被人体吸收。则下列说法错误的是 [ ]

A. 此事件已对环境造成污染            

B. 镉是人体必需补充的微量元素 

C. 烧碱是氢氧化钠的俗称              

D. 烧碱和熟石灰都是碱

考点:酸、碱、盐化学元素和人体健康物质的俗称
题型:选择题

情景对话

     根据对话情景和内容,从对话后所给的选项中选出能填入每一空白处的最佳选项。

选项中有两个为多余选项。

Crystal: Hi, I just had a very interesting experience.

Jimmy: What is it?

Crystal:     1     It is the first day of my one-week program.

Jimmy: That sounds like fun.

Crystal: Yes, it was fun…but tiring! Kids are so energetic.

Jimmy:    2    

Crystal: At the primary school down the street. I visited some of their classes in the morning, and then taught them some simple English in the afternoon.

Jimmy: English must be very difficult for them.

Crystal:    3     I was quite impressed.

Jimmy: What did you teach them?

Crystal: One teacher asked me to practice some sentences.     4    

Jimmy: That’s great. You know, when I was in primary school, we never had English lessons.

Crystal: How about in middle school?

Jimmy:    5   It wasn’t very practical.

Crystal: Well, but you’ve managed to learn English very well.

A.I spent the whole day with dozen of little children!

B.I helped my aunt look after her child at home.

C.Yes, they find t hard to learn.

D.Where did you meet all these kids?

E.We studied English, but only for tests.

F.Actually, they were very eager to learn.

G.We also played some English games together.

题型:选择题

仓库里的呆废货物多了,就会影响库容的利用,因此设计了一个“呆废货品率”指标。该指标是属于()评价指标的。

A.进出库作业效率 

B.储存作业 

C.订单处理作业 

D.备货作业效率

题型:选择题

新装饰的居室中,常常有一种可使人眼红、流泪和咳嗽的刺激性气体,这很可能是()

A.SO2

B.CO

C.CO2

D.甲醛

E.氮氧化物

题型:选择题

爆破工在接到起爆命令后,必须先发出爆破警告,至少再等多少秒,方可起爆?

题型:选择题

浪涌保护器连接导线长度有何要求?在什么情况下在两级浪涌保护器之间应加装退耦装置?

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