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问题 多项选择题

关于管沟开挖，正确的是（）。

A.沟槽土方应堆在沟的一侧，便于下一道工序作业

B.堆土底边与沟便应保持一定距离，不得小于1m，高度应小于1.5m

C.人工挖槽深度宜为2m左右

D.人工开挖多层槽的层间留台宽度应不小于500mm

答案

参考答案：A, B, C, D

听力题

Today some people call Amsterdam the“City of Bicycles”because it is a city which is flat and convenient(方便的)for bicycles.

In the 1960s, a group of cycling fans had an i  46 . They believed that it would be better for everybody if o  47  bicycles were allowed in the city centre. They were hopeful that this would help to save energy, reduce pollution and provide free public transport. The group p  48  hundreds of bicycles white and placed them in public places around Amsterdam for people to use.  A  49  was allowed to take them and use them for short journeys, whether he was a local or a foreigner. Wherever someone finished a journey, they would l  50  the bike there for someone else to use. The problem was that it didn’t work –t  51  took all the bicycles within weeks!

H  52 , more than thirty years later，the“white bike”is back in town---this time with a computer chip(芯片)to r  53  its every move! There is a  54  less traffic in central Amsterdam. Thanks to the good ideas of lots of people, like the cycling fans in the 1960s, many people around the world have been enjoying city centre streets w  55  cars for many years.

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多项选择题

企业电子商务战略的特点（）。

A.电子商务战略具有全局性

B.企业电子商务战略具有长远性

C.企业电子商务战略需要考虑企业外部环境中的诸多因素

D.企业电子商务战略其艺术性高于科学性

E.企业电子商务战略具有协同性
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