已知⊙O和不在⊙O上的一点P,过P的直线交⊙O于A,B两点,若PA•PB=24,

题型:填空题

问题:

已知⊙O和不在⊙O上的一点P,过P的直线交⊙O于A,B两点,若PA•PB=24,OP=5,则⊙O的半径长为______.

考点:直线与圆的位置关系(直线与圆的相交,直线与圆的相切,直线与圆的相离)
题型:填空题

限速器绳最大张力应如何检验?

题型:填空题

选择词语解释正确的一项(  )

A视事三年(官员到职工作)   衡乃《两都》作《二京赋》(打算)

B武等至匈奴(适逢)     而世之奇伟、瑰怪、非常之(景象)

C君我降(因为)         卧起操持(拿着)     天雪(下)

D臣等不肖(不才)         见欺(白白地)

题型:填空题

Reading comprehension.

     One evening after dinner, Mr and Mrs. Tisich called a family meeting. "We've had to make a difficult

decision," Mr. Tisich announced. "You see, your mother has been offered a post as co-director of a television

station in Chicago Unfortunately, the station is not here. After thinking long and hard about it,we've concluded

that the right decision is to move to Chicago."

     Marc looked shocked,while his sister Rachel breathlessly started asking when they'd be moving. "It's

surprising,but exciting!" She said. Marc simply said, "We can't go-I can't leave all my friends.I'd rather stay

here and live with Tommy Lyons!"

     The Tisichs hoped that by the time they moved in August, Marc would grow more accustomed to the idea

of leaving. However, he showed no signs of accepting the news, refusing to pack his belongings.

     When the morning of the move arrived, Marc was nowhere to be found. His parents called Tommy Lyons's

house, but Mrs. Lyons said she hadn't seen Marc. Mrs. Tisich became increasingly concerned, while her

husband felt angry with their son for behaving so irresponsibly.

     What they didn't know was that Marc had started walking over to Tommy's house,with a faint idea of

hiding in the Lyons's attic (阁楼) for a few days. But something happened on the way as Marc walked past all

the familiar landscape of the neighborhood: the fence that he and his mother painted, the tree that he and his

sister used to climb, the park where he and his father often took evening walks together. How much would

these mean without his family, who make them special in the first place? Marc didn't take the time to answer

that question but instead hurried back to his house, wondering if there were any moving cartons (纸板箱) the

right size to hold his record collection.

1. The conflict in this story was caused by _____.

A. Marc and Rachel's different tempers

B. a quarrel between Tommy Lyons and Marc

C. Marc's disagreement with his parents about their move

D. Mr.and Mrs. Tisich's remark of Marc's irresponsibility

2. Marc and Rachel's reactions to the move were similar in the way that both were _____.

A. surprised

B. angry and upset

C. anxious for more details

D. worried about packing

3. The reason for Marc's going home was that _____.

A. he did not want to be left behind

B. he realized his family was essential to him

C. he hoped to reach an agreement with his parents

D. he wished to be a more responsible person

4. What would most likely happen next?

A. Marc would bring his records over to the Lyons's house.

B. Mr. and Mrs. Tisich would call the police.

C. Marc would join his family for house moving.

D. Mr.and Mrs. Tisich would start searching for Marc.

题型:填空题

工程项目施工招标投标工作中,建设行政监督部门自收到备案材料之日起()内没有提出异议,招标人可发布招标公告或发出投标邀请书。

A.5日

B.5个工作日

C.10日

D.10个工作日

题型:填空题

异物被吸入气管后,最先发生的症状是()

A.呼吸困难

B.剧烈呛咳、憋气、面色青紫

C.肺听诊啰音、哮鸣音

D.听诊声门下拍击音

E.心力衰竭

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