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【简答题】
People use their mouths for many things. They eat, talk, shout and sing. They smile and they kiss. In the English language, there are many expressions using the word“mouth”. For example, if you say bad things about a person, the person might protest and say“Do not bad mouth me. ”Sometimes, people say something to a friend or family member that they later regret because it hurts that person’s . Or they tell the person something they were not supposed to tell. The speaker might say:“I really put my foot in my mouth this time. ”If this should happen, the speaker might feel down in the mouth. In other words, he might feel sad for saying the wrong thing. Another situation is when someone falsely claims another person said something, the other person might protest,“I did not say that . Do not put words in my mouth. ” Some people have lots of money because they were born into a very rich family. There is an expression for this, too. You might say such a person“Born with a silver spoon in his mouth. ”This rich person is the opposite of a person who lives from hand to mouth. This person is very poor and only has enough money for the most important things in life, like food. Parents might sometimes keep a child off sweet food as a form of punishment for saying bad things. For example, if a child says things she should not say to her parents, she might be described as a mouthy child. The parents might even tell the child to stop mouthing off. But enough of all this talk, I have been running my mouth long enough.
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参考答案:
举一反三
【单选题】________ are formed by noting current prices, remembering past prices, or assessing the buying situation.
A.
Product line prices
B.
Seasonal prices
C.
Reference prices
D.
Time-based prices
E.
Product bundle prices
【简答题】质点沿半径为R=0.1m的圆周运动,运动学方程为 (SI) ,则t=2s时刻质点的法向加速度大小为 .
【简答题】一质点沿半径为 R = 0.1 m 的圆周运动,其角位置由下式表示: (SI),则在 t = 2 s 时,其切向加速度为 m/s 2 。(取二位有效数字)
【简答题】质点沿半径R=0.1m的圆周运动,其运动学方程为 ,则t=2s时质点的切向加速度 =____ ;法向加速度a n =____。
【简答题】一质点沿半径为 R = 0.1 m 的圆周运动,其角位置由下式表示: (SI),则在 t = 2 s 时,其法向加速度为 m/s 2 。(取三位有效数字)
【单选题】一质点沿半径为 R=0.1m 的圆周运动,其角位移θ可用下式表示: (SI) .当 切向加速度大小恰为总加速度 大小的一半时, ,其角位移 θ =
A.
π/6
B.
π/3
C.
2.87 rad
D.
3.73 rad
【简答题】一质点沿半径 r = 0.1m的圆周运动,其角位置可用 表示(SI单位),则 t = 1 s 时,质点的切向加速度大小为 ,法向加速度大小为 。
【判断题】公开招标和邀请招标都应该在国家或者地方指定媒介上发布招标信息。()
A.
正确
B.
错误
【单选题】利用数值积分计算三重积分, 下列程序正确的是( )
A.
f=inline('4*x.*y.*z','x','y','z') I=dblquad(f,0,pi,0,pi,0,1)
B.
f=inline('4*x.*y.*z','x','y','z') I=triplequad(f,0,pi,0,pi,0,1)
C.
I=int(4*x.*y.*z,0,pi,0,pi,0,1)
D.
以上程序都不正确
【单选题】一质点沿半径R=0.1m的圆周运动,其角位移θ可用θ=2+4 (SI)表示,(1)则当t=2s时,切向加速度=_______;(2)切向加速度大小为总加速度大小的一半时,θ=________。 上述两空正确的答案是下列哪个?
A.
0.8m/ ;  2.87rad
B.
0.8m/ ;    1.6rad
C.
0.8m/ ;    2.6rad
D.
0.8m/ ;    3.7rad
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