已知A(1,1),B(4,3),C(2m,m-1), (Ⅰ)若A,B,C可构成三

题型:解答题

问题:

已知A(1,1),B(4,3),C(2m,m-1),

(Ⅰ)若A,B,C可构成三角形,求实数m所要满足的条件;

(Ⅱ)若A,B,C,构成以∠C为直角的直角三角形,求实数m的值.

考点:平面向量基本定理及坐标表示用数量积判断两个向量的垂直关系
题型:解答题

Think rock, paper, scissors is a children’s game? Think again.

Top players from around the world came together in Toronto to compete for a ten thousand Canadian dollar prize and the title of world champion.

More than 500 players, including national champions from Australia, Norway and New Zealand, attended.

The simple game is often used to make decisions and solve some simple problems.

Players hold their fists closed and count to three before making a fist (rock), a flat hand (paper) or two fingers (scissors). Paper covers rock, scissors cut paper and rock breaks scissors.

Players have different ideas about the history of the game, but it is commonly believed to have been played for centuries in Japan.

The Paper Scissors Stone Club opened in England in 1842 and players could play together there.

In 1918, the name was changed to World RPS Club and its headquarters moved from London to Toronto.

The world championship has been held since 2002, which is held once every year.

小题1:The winner of the game can get ___________ Canadian dollars as a prize.

A. 10,000               B. 100,000          C. 1,000,000

小题2:The game has been played in Japan ___________.

A. since people invented it         B. for about one thousand years

C. since several hundred years ago

小题3:When did World RPS Club’s headquarters move to Toronto?

A. In 1842          B. In 1898          C. In 1918

小题4:The ___________ world championship will be held in 2012.

A. ninth                B. tenth                C. eleventh

小题5: In the writer’s opinion, ___________.

A. the game is often used to solve big problems.

B. the game is not just a children’s game

C. the game was first played in Japan

题型:解答题

SQL语言是 ______。

A.高级语言

B.结构化查询语言

C.第3代语言

D.宿主语言

题型:解答题

据报道,美国洛杉矶、纽约和日本东京、大阪等地曾多次发生急性中毒烟雾事件,后证实这烟雾是大气中某些污染物在紫外线作用下发生光化学反应所形成的一种混合烟雾。

引发烟雾的主要污染物是

A.SO2、NOX

B.SO2、烟尘

C.NOX、碳氢化合物

D.碳氢化合物、CO

E.CO、烟尘

题型:解答题

在实验中发生乙醚等易燃气体泄露时应对和处置方法。

题型:解答题

铁路罐车()由中梁、枕梁、罐体鞍座、端梁及一些附属件组成

A、罐底

B、底架

C、筒身

D、封头

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