一个三角形的两个内角分别是30。和70。,另一个内角是(),这是一个()三角形。

题型:填空题

问题:

一个三角形的两个内角分别是30和70,另一个内角是(    ),这是一个(    )三角形。

考点:三角形的分类三角形的内角和
题型:填空题

已知f(x)是定义在R上的奇函数,且当x>0时f(x)=x3+x+1,求f(x)的解析式.

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An earthquake is one of the most common natural disasters. It may cause great damage. So it is wise to learn some simple safety tips to protect yourself or your family members.

Fragile items, like those made of glass are easily broken and should usually be placed on a lower surface, near the ground instead of placing them on cupboards higher up. Never place them near your bed, sofas and other furniture where you would be sitting or lying down. When there is a strong movement, these pieces will fall on the floor directly and not on you.

There is a strong chance of short circuits (短路) and fire breakouts during an earthquake. Make sure you turn off electrical connections and gas immediately when an earthquake happens.

During an earthquake, lie beneath an object that is not easily damaged. Do not go near objects that could directly fall on you. Never use the elevator to go down. Stay inside until the shaking stops and it is safe to go outside. Research has shown that most injuries happen when people inside buildings try to go out. Use the staircases at all times.

If you are outdoors, do not take shelter under a tree, streetlights, electric poles or tall buildings. If you are driving, stop your car and stay in a safe place. Do not park your car under a tree or any tall object.

If trapped in debris (瓦砾堆), cover your mouth with a handkerchief or clothing. Tap on a pipe or wall so rescuers can find you. Use a whistle (哨子) if one is available. Never shout for help. Shouting can cause you to breathe in dangerous amounts of dust. Do not light a match because you may burn yourself. Do not move about or kick up dust.

小题1:The purpose of the passage is to tell readers _____.

A.the damage caused by earthquakes

B.the rescue work after earthquakes

C.what to do about earthquakes

D.how to prevent earthquakes小题2: The underlined word “Fragile” in Paragraph 2 probably means _____.

A.easily broken

B.easily found

C.expensive

D.heavy小题3:To reduce the injury from the earthquake, items made of glass should be put _____.

A.on cupboards

B.in the bedroom

C.on a lower surface

D.where children can’t reach them小题4:During the earthquake, people are advised to _____.

A.go out the building at once

B.turn off electricity and gas immediately

C.take shelter under a tree

D.drive to a safe place quickly小题5:What should people NOT do when they are trapped in debris?

A.Cover their mouth with a handkerchief.

B.Tap on a pipe or wall for help.

C.Use a whistle for help.

D.Light a match for help.

题型:填空题

斑秃脱发区的特点不包括()

A.境界清楚

B.进展期拉发试验多为阳性

C.无鳞屑

D.呈炎性红斑

E.无瘢痕

题型:填空题

东南地区某学校地理活动小组在学校周围进行地理考察活动,了解学校附近盛产的农产品是()

A.苹果

B.小麦

C.柑橘

D.大豆

题型:填空题

数学家欧几里德运用()方法证明了正弦定理。

A.面积变换

B.向量

C.实验

D.假设

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