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【简答题】
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 small. The population of Australia is nearly as large as that of Shanghai. Enough laws have been made to fight against 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 (展览).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 a 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. After a short drive from any town, you will find yourself in the middle of white sheep. Sheep, sheep, everywhere are sheep. 小题1:Australia is A.the largest country in the world B.larger than China C.as large as Shanghai D.not so large as China 小题2:Enough laws have been made to__ A.increase the population B.grow more plants C.fight against pollution D.show wild flowers 小题3:Perth is_ A.the capital of Australia B.in the west of Australia C.in the east of Australia D.the biggest city in Australia 小题4:In Perth you may visit a wild flowers' exhibition in A.October B.January C.May D.July 小题5:Which of the following sentences is TRUE? A.All the big cities in Australia are seriously polluted. B.Australia .is famous for its sheep, kangaroos and large population. C.We ran back to the car because we were in the middle of the white sheep.. D.If you go to the countryside in Australia, you will see a large number of White sheep.
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【单选题】当已有进程进入临界区时,其他试图进入临界区的进程必须等待,以保证对临界资源的互斥访问,这是下列 同步机制准则。
A.
空闲让进
B.
忙则等待
C.
有限等待
D.
让权等待
【简答题】“84消毒液”能有效杀灭甲型H1N1病毒,某同学购买了一瓶某品牌“84消毒液”, 并查阅相关资料和消毒液包装说明得到如下信息: “84消毒液”:含25%  NaClO、1 000 mL、密度1.19 g·cm - 3 ,稀释100倍(体积比)后使用。请根据以上信息和相关知识回答下列问题: (1)该“84消毒液”的物质的量浓度为________mol·L - 1 。 (2)该同学取100 mL该品牌...
【判断题】杆件两端受到等值、反向且共线的两个外力作用时,会产生轴向拉伸或压缩变形。
A.
正确
B.
错误
【判断题】杆件两端受等值、反向且共线的外力作用时,一定会产生轴向拉伸或压缩变形。
A.
正确
B.
错误
【简答题】请为工业机器人和智能机器人给出定义。
【判断题】杆件两端受到等值、反向且共线的两个外力作用时,一定产生轴向拉伸或压缩变形。
A.
正确
B.
错误
【单选题】某些牙膏中含有的消毒剂三氯生遇含氯自来水能生成三氯甲烷,哥罗芳能导致肝病甚至癌症,已知三氯生的结构简式如图。有关说法正确的是()。
A.
三氯生的分子式为:C 12 H 6 Cl 3 O 2
B.
三氯甲烷只有一种结构,可推知CH 4 是正四面体
C.
三氯生能与NaOH溶液反应
D.
常温下,三氯生易溶于水
【单选题】“四体液”致病说中的四体液是指
A.
血液、粘液、黄胆汁、胆汁
B.
血液、粘液、黄胆汁、致病汁
C.
血液、粘液、黄胆汁、黑胆汁
D.
血液、粘液、黄胆汁、干胆汁
【单选题】除去乙酸乙酯中的乙酸最好的方法是
A.
用水洗
B.
用盐酸洗
C.
用氢氧化钠溶液洗
D.
用饱和Na2CO3溶液洗
【判断题】采用直接耦合的前后级放大电路的静态工作点互相牵制。( )
A.
正确
B.
错误
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