已知下列四组线段:①5,12,13;②15,8,17;③1.5,2,2.5;④5

题型:选择题

问题:

已知下列四组线段:①5,12,13;②15,8,17;③1.5,2,2.5;④
5
4
,1,
3
4
.其中能构成直角三角形的有(  )
A.四组B.三组C.二组D.一组
考点:勾股定理的逆定理
题型:选择题

根据短文判断正误,正确写“T”,错误写“F”。

     Martin told me something interesting about him. He was on vacation in the United States last summer.

He stayed in a hotel and there was a big fire (火) in the room next to his room. He thought he heard a baby

crying, so he ran into the room with fire. When he got in, he saw that the TV was on and found that the

baby was on TV. So Martin took the television and ran out of the room. Then the firemen came and put out

(扑灭) the fire.

( )1. Martin went to America on vacation.           

( )2. There was a big fire in Martin's room.       

( )3. Martin wanted to save the baby.               

( )4. The baby was on the Television.               

( )5. In fact, Martin saved the television at last. 

题型:选择题

二阶系统的特征根是一对负实部的共轭复根时,二阶系统的动态响应波形是什么特点?

题型:选择题

休克患者采取何种体位最为合理()。

A.平卧位

B.右侧卧位

C.头低15°,足高25°

D.下肢低垂10°~15°

E.头躯干抬高20°~30°,下肢抬高15°~20°

题型:选择题

关于所得税中劳务报酬的应纳税所得额的规定,下列说法错误的是( )。

A.劳务报酬达4000元以上者,应该先减除20%的费用,余额为应纳税所得额;如果应纳税所得额在20000元以下,则适用税率为20%

B.劳务报酬达4000元以上者,应该先减除20%的费用,余额为应纳税所得额;如果应纳税所得额在20000元至50000元之间,则适用税率为30%,速算扣除2000元

C.劳务报酬达4000元以上者,应该先减除20%的费用,余额为应纳税所得额;如果应纳税所得额在50000元以上,则适用税率为50%,速算扣除数为8000元

D.每次收入不超过4000元者,减除费用800元

题型:选择题

有关贸易术语的国际贸易惯例主要有()

A.《1932年华沙—牛津规则》

B.《1941年美国对外贸易定义(修订本)》

C.《2000年国际贸易术语解释通则》

D.《海牙规则》

E.《汉堡规则》

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