问题 填空题

在空间直角坐标系中,在Ox轴上的点P1的坐标特点为 ______,在Oy轴上的点P2的坐标特点为 ______,在Oz轴上的点P3的坐标特点为 ______,在xOy平面上的点P4的坐标特点为 ______,在yOz平面上的点P5的坐标特点为 ______,在xOz平面上的点P6的坐标特点为 ______.

答案

由空间坐标系的定义知;

Ox轴上的点P1的坐标特点为(x,0,0),在Oy轴上的点P2的坐标特点为(0,y,0),在Oz轴上的点P3的坐标特点为 (0,0,z),在xOy平面上的点P4的坐标特点为(x,y,0),在yOz平面上的点P5的坐标特点为(0,y,z),在xOz平面上的点P6的坐标特点为(x,0,z).

故答案应依次为(x,0,0),(0,y,0),(0,0,z),(x,y,0),(0,y,z),(x,0,z).

阅读理解

You know Australia is a big country, but you may not know how easy it is to get around. The untouched beaches that go for miles and deserts that touch the horizon are just there, waiting to be reached and explored. The following are the different ways you can explore our vast country.

Getting around Australia

Air

Flying is the best way to cover large distances in a short time. You can spend more time on the Australia's can't-miss landscapes and relaxing lifestyle. Moreover, competition among airlines makes great flying fees available for you.

Drive

Australia has a vast network of well-maintained roads and some of the most beautiful touring routes in the world. You have no difficulty finding car rental companies at major airports, central city locations, suburbs and attractions.

Bus

Bus travel in Australia is comfortable, easy and economical. Buses generally have air conditioning, reading lights, adjustable seats and videos. Services are frequent, affordable and efficient.

Rail

Train travel is the cheapest and gives you an insight into Australia's size and variety, all from the comfort of your carriage. Scheduled services are a great way to get quickly between our cities and regional centers.

Ferry(轮渡)

The Spirit of Tasmania runs a passenger and vehicle ferry service between Melbourne and Tasmania nightly. Extra sen ices are running during summer rush hours. Sea-link ferries connect South Australia and Kangaroo Island several times a day. Ferries connect suburbs in our capital cities.

Walk

With easy-on-the-feet pedestrian.(行人)streets, walking is a great way to get around our cities.

Besides all the above, you can also experience some of the longest: tracks and trails in the world in central Australia——impressive journeys of a thousand kilometers or more that can take several weeks to complete.

小题1:The underlined word "untouched" in Paragraph 1 means  .

A.secure

B.special

C.natural

D.artificial小题2:Which of the following is true about travelling in Australia?

A.You can easily rent a car to explore its beautiful touring routes.

B.More travellers make the flying fees among airlines higher than before.

C.Taking a bus tour is the most comfortable, economical and efficient way.

D.Train services can offer you more comfort than any other means of transport,小题3:Ferry service between Melbourne and Tasmania usually runs  •

A.several times a day

B.only at night hours

C.between different cities

D.only during rush hours小题4:From the passage, we know that.

A.travelling in central Australia is time-consuming

B.central Australia has the world's shortest railway line

C.pedestrian walking is a great way to travel between cities

D.you have no choice but to walk over 1,000 kilometers in central Australia

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