问题 问答题

某二级建筑施工企业试验室受××建筑工程单位的委托,对即将进入施工现场的水泥进行水泥细度检验和水泥标准稠度用水量测定。已知,该试验室随机从25袋袋装水泥中抽 取等量水泥,经混拌均匀后,从中称取15kg的水泥作为试样。用于标准稠度用水量测定的水泥砂浆,已采用水泥净浆搅拌机搅拌(经过低速拌120s,停15s,将叶片和锅壁上的水泥刮入锅中间,然后高速搅拌120s后)制成水泥净浆。

请根据上述条件,回答下列问题。

若该试验室采用80μm筛筛析法检验水泥细度,那么可以选择哪几种测定方法当检测结果不同,出现争议时,应以哪种测定方法为准?

答案

参考答案:

若该试验室采用80μm筛筛析法检验水泥细度,可以选择负压筛法、水筛法和手工筛法三种测定方法,如果三种测定的结果不同,出现争议,应以负压筛法测定结果为准。

单项选择题
阅读理解

Every object tells a story. Even the most ordinary objects can present to us powerful images. Sometimes it is the ordinary nature of these objects that actually makes them so extraordinary. Such is the case with an old leather shoe in a museum in Alaska. At first glance it does not look like much. It is a woman’s shoe of a style popular in the 1890s. But what is unique(独特的) about this shoe is where it was found. It was discovered on the Checkout Pass, the famous trail used by the people seeking gold in Alaska. Who it belonged to or why it was left there is not known. Was it perhaps dropped by accident as the woman climbed up the 1500 stairs carved outface? Or did she throw away goods that she didn’t need in order to travel lighter?

Over 100, 000 people with “gold fever” made this trip hoping to become millionaires. Few of them understood that on their way they would have to cross a harsh wildness. Unprepared for such a dangerous journey, many died of starvation and exposure to the cold weather.

The Canadian government finally started requiring the gold seekers to bring one ton of supplies with them. This was thought to be enough for a person to survive for one year. They would carry their supplies in backpacks(背包) each weighing up to fifty pounds; it usually took at least 40 trips to get everything to the top and over the pass. Whoever dropped the shoe must have been a brave and determined woman. Perhaps she was successful and made it to Alaska. Perhaps she had to turn back in defeat. No one will ever know for sure, but what we do know is that she took part in one of the greatest adventures in the 19th century.

小题1:The ordinary woman’s leather shoe is considered unusual because ______. 

A.it was an important clue to life in the past

B.it was found on a famous trail

C.it at one time belonged to a VIP

D.it was a fashionable shoe at that time小题2:According to this passage, many people who went to Alaska ______. 

A.eventually became millionaires

B.brought with them many shoes

C.had conflicts with the Eskimos

D.were not properly equipped小题3: The Canadian government made gold seekers bring one year’s supplies with them so that ______.

A.they would not die of hunger and cold

B.the army would have enough food for fighting a war

C.they would change these goods with the Eskimos

D.the supplies would make Alaska rich小题4:No matter what happened to the woman who owned the shoe, ______. 

A.she must have lived a happy life

B.she certainly dropped the shoe on purpose

C.her adventurous spirit is definitely admired

D.her other shoes were equally fashionable