34的分子扩大3倍，要使分数大小不变，分母应（ ） A．扩大3倍 B．缩小3倍 C．扩

根据短文内容，判断下列句子的正误，正确的用“T”，错误的用“F”。

     Do you know Australia? Australia is the largest island in the world. It is a little smaller than China. It is

in the south of the earth. Australia is big, but its population is not large. The population of Australia is nearly

as large as that of Shanghai.

     The government has made enough laws to fight pollution. The cities in Australia have got little air or water

pollution. The sky is blue and the water is clean. You can clearly see fish swimming in the rivers. Plants grow

very well.

    Last month we visited Perth, the biggest city in Western Australia, and went to a wild flowers' exhibition.

There we saw a large number of wild flowers we had never seen before. We had a wonderful time. Perth is

famous for its beautiful wild flowers. In spring every year Perth has the wild flowers' exhibition. After visiting

Perth, we spent the day in the countryside. We sat down and had a rest near a path at the foot of a hill. It was

quiet and we enjoyed ourselves. Suddenly we heard bells ringing at the top of the hill. What we saw made us

pick up all our things and run back to the car as quickly as we could. There were about three hundred sheep

coming towards us down the path.

    Australia is famous for its sheep and kangaroos (袋鼠). After a short drive from any town, you will find

yourself in the middle of white sheep. Sheep, sheep, everywhere are sheep.

( )1. Australia is the largest country in the world.                                  

( )2. The government had made so many laws but it can hardly fight pollution.            

( )3. Perth lies in the west of Australia.                                                 

( )4. In Perth you may visit a wild flowers' show in October.                              

( )5. If you go to the countryside in Australia, you will see a large number of white sheep.

税务机关发现纳税人多缴税款的，应当自发现之日起( )日内办理退还手续。

A．无限期

B．10日

C．3年

D．30日

医疗机构的从业人员基本行为规范：①以人为本，践行宗旨；②遵纪守法，依法执业；③尊重患者，关爱生命；④优质服务，医患和谐；⑤廉洁自律，恪守医德；⑥严谨求实，精益求精；⑦爱岗敬业，团结协作；⑧乐于奉献，热心公益。请选择正确（）。

A.①、②、④、⑥、⑧

B.①、③、⑤、⑦、⑧

C.②、④、⑤、⑥、⑦

D.②、③、⑥、⑦、⑧

E.以上都是

医德义务的特点是（）

A.医务人员对服务对象的一种承诺

B.不以获得权力为前提

C.以提高医疗质量为目的

D.以规章制度为保障

E.以法律规范为保障

背景：某工程用混凝土，经和易性调整、强度校核及表观密度测定，确定其单位用水量为190Kg，砂率宜用0.34，水灰比应用0.50，该混凝土的表观密度为2400kg/m3。

（一）计算该混凝土的试验室配合比。

（二）若该项混凝土用42.5强度等级的普通水泥（实测强度为48.0MPa）、碎石、中砂，估算其28天抗压强度。

（三）若掺用木钙减水剂，经试验减水率15%，计算每立方米混凝土的水泥用量。

（四）若施工现场砂含水率为3%，石子含水率为1%，计算施工配合比。

（五）若用I级粉煤灰取代部分水泥（取代率20%，超量取代率1.5），试调整其配合比（根据问题一所计算的试验室配合比）

附：

采用碎石时：αa=0.46，αb=0.07

几种材料的视密度：砂为2.68g/cm3水泥为3.0g/cm3粉煤灰为2.2g/cm3）。

施工现场配合比（以水泥用量为1计）为（）。

A：1：1.76：3.22：0.40

B：1：1.74：3.21：0.42

C：1：1.72：3.32：0.40

D：1：1.69：3.21：0.42