若cos(π2-α)-cos(2π-α)=75,α是第二象限的角,则tanα=_

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问题:

若cos(
π
2
-α)-cos(2π-α)=
7
5
,α是第二象限的角,则tanα=______.
考点:三角函数的诱导公式
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— Can I use the telephone on the table, sir?

— Under no circumstances _____ to use the telephone in the office for personal affairs. [ ]

A. anyone is allowed

B. nobody is allowed

C. is anyone allowed

D. is nobody allowed

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下列哪一个属于非竞争性拮抗作用:

A.氟马西尼解救苯二氮革类中毒

B.氨基糖苷类抗生素加强硫酸镁引起的呼吸麻痹

C.维生素B6降低左旋多巴的疗效

D.排钾利尿剂使心脏对强心苷敏感化

E.单胺氧化酶抑制剂与氯丙嗪合用,增加安定作用

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B
Just 7 km east of Sydney’s city center lies Australia’s most famous beach – Bondi, with its glorious strip of golden sand and blue water. Other delightful surf beaches and small bays stretch south to Maroubra , while the harbour suburbs to the north offer sandy bays and the bushland of Sydney Harbour National Park . The life saving movement was founded in Australia in the early 1900s , and now Bondi and Bronte each claim to be the world’s first surf club .
1.Beaches
Surf and sand from Bondi to Maroubra , plus calm harbour beaches .
●With its rolling surf and long are of sand , Bondi is the region’s best-known beach and the liveliest of all the ocean suburbs .
●Four more surf beaches lie south of Bondi—Tamarama , Bronte , Coogee and Maroubra —as well as calmer Clovelly and Cordons Bay .

 

 
2.         

 
Lively beachfront dining and shopping strips , and charming harbours .
●Bondi, Bronte , Coogee and Maroubra all offer a delightful seaside town atmosphere —complete with beachwear and surf shops , pubs and outdoor cafes .
●Take a boat from Circullar Quay to one of the harbour suburbs—there is Rose Bay with its parks and harbourside restaurants , Vaucluse , home of Vaucluse House , and Watsons Bay , with a famous seafood restaurant and wonderful views up the harbour .
3. Inland
Shops , cafes , restaurants , parks and several major attractions .
●Paddington and Woollahra are famous for their cafes , small shops , art galleries , markets and nearby Centennial Park , one of Sydney’s largest open spaces .
●Visit Bondi Junction for its largest shopping center and cinema complex .
4. Activities
From surfing and diving to walks , golf and seaplane rides .
●Learn to surf at Bondi , Bronte or Coogee , go diving at Gordons Bay (where there is an underwater trail ), or watch a summer surf carnival .
●Play golf at Bondi Beach , Rose Bay or Moore Park , enjoy a game of tennis , and go horse riding at Centennial Park .


 
59.Which of the following best shows the location of each city?

 
60.What is the most suitable heading for Part 2?
A.Shops.                B.Harbours.            C.Bays.                  D.Cafes.
61.If you want to see a film after shopping, you’d better go to          .
A.Paddington          B.Centennial Park   C.Bondi Junciton    D.Gordons Bay
62.About Bondi, which of the following is not mentioned in the article?
A.position and surroundings.                    B.entertainment and activities.
C.scenery and views.                               D.history and places of interest.
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下面哪种做法是为了减小摩擦?(  )

A.在鞋底、轮胎上刻有凹凸不平的花纹

B.下雨天在泥泞的路面上撒些炉渣或沙子

C.用滚动摩擦代替滑动摩擦

D.增大压力和增大接触面之间的粗糙程度

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日本领土组成中的四个大岛,纬度最高的是(    )

A.北海道岛

B.本州岛

C.四国岛

D.九州岛

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