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问题 选择题

已知∠AOB=45°，点P在∠AOB内部，P1与P关于OB对称，P2与P关于OA对称，则P1，O，P2三点构成的三角形是[ ]

A.直角三角形

B.等腰三角形

C.等边三角形

D.等腰直角三角形

答案

答案：D

阅读理解

There are forty-eight students in our class. There are twenty-three boys and twenty-five girls. Some students live near the school, and some others live very far from the school. About half of the students come to school by bike. They often get to school at a quarter to seven. About ten students often come to school by bus. They often go to school very early, too. Another ten students come to school on foot. Their homes are near the school, but they are often late for school, because they get up very late.

小题1:More than half of the students usually come to school           .

A．very late

B．very early

C．by bus

D．on foot小题2:Some students are often late for school because          .

A．their homes are far from the school

B．they go to school on foot

C．they get up very late

D．they don’t like going to school小题3:About        students go to school by bike.

A．forty-eight

B．ten

C．twenty

D．twenty-four小题4:About ten students often come to school by bus because            .

A．their homes are not near the school

B．they don’t have any bikes

C．they can’t ride bike

D．they want to go to school very early小题5:How many students get to school by bus and on foot?

A．About thirty-eight

B．About twenty

C．About ten.

D．About twenty-five
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问答题 简答题

停机后凝汽器冷却水管查漏（低水位查漏）如何进行？
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