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【单选题】
In one way of thinking, failure is a part of life. In another way, failure may be a way towards success. The ―spider story‖ is often told. Robert Bruce, leader of the Scots in the 13th century, was hiding in a cave from the English. He watched a spider spinning a web(蜘蛛织网). The spider tried to reach across a rough place in the rock. He tried six times without success. On the seventh time he made it and went on to spin his web. Bruce is said to have taken heart and to have gone on to defeat the English„ Edison, the inventor of the light bulb, made hundreds of models that failed before he found the right way to make one.So what? First, always think about your failure. What caused it? Were conditions right? Were you in top from yourself? What can you change so things will go right next time?Second, is the goal(目标)you're trying to reach the right one? Try to do some thinking about what your real goals may be. Think about his question, “If I do succeed in this, where will it get me?”This may help you prevent failure in things you shouldn't be doing anyway.The third thing to bear in mind about failure is that it's a part of life. Learn to ―live with yourself even though you may have failed. Remember, ―You can't win them all.The author tells you to do all things except ______.
A.
The think about the cause of your failure
B.
to check out whether your goals are right for you
C.
to consider failure as a part or life
D.
to bear in mind that you will never fail in your life
E.
to tell him that he should cheer up
F.
To warn him that failure is terrible
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【单选题】在两种商品(X和Y)、两种生产要素(L和K)的经济中,达到生产的全而均衡条件为(    )。
A.
MRTS LK =P L /P K
B.
(MRTS LK ) X =(MRTS LK ) Y
C.
MRT XY =MRS XY
D.
MRTS LK =MRS XY
【简答题】在图6-50所示电路中,理想变量器的变比n=10,u 1 (t)=100sin(314t+300)V,R=10Ω,C=0.1F,求电路在正弦稳态下的电流i 1 (t)、i 2 (t)和电压u 2 (t)。
【单选题】正弦电流幅值为10A,初相位为-π/6,周期为0.02s,则电流瞬时值表达式为______。
A.
i(t)=10sin(314t-30O )A
B.
i(t)=10sin(0.02t-π/6 )A
C.
i(t)=14.14sin(100πt+60O )A
D.
i(t)=10sin(50t-π/6 )A
【多选题】闸底板上、下游端一般设有齿墙,因为有利于 ,并 。
A.
防渗
B.
减小扬压力
C.
增加闸室抗滑稳定性
D.
排出渗流
【单选题】20 测定液体供试品比旋度的公式应是( )。
A.
[α]D(20)=α/d•1
B.
[α]D(20)=100α/C•1
C.
[α]D(20)•C=α/d
D.
C=100α/[α]D(20)•1
【单选题】在两种商品(x和y)、两种生产要素(L和K)的经济中,达到生产的总体均衡条件为( )
A.
(MRTSLK)x=(MRTSLK)y
B.
MRTSLK=PL/PK
C.
MRTSLK=MRSxy
D.
MRTxy=MRSxy
【单选题】在两种商品(X和Y)、两种生产要素(L和K)的经济中,达到生产的总体均衡的条件为( )
A.
MRTS LK = P L /P K
B.
MRTS LK = MRS XY
C.
MRT XY =MRS XY
D.
MRTS X LK =MRTS Y LK
【单选题】在两种商品(X和Y)、两种生产要素(L和K)的经济中,达到生产的全面均衡的条件为(    )。
A.
MRTS LK =P L /P K ;
B.
MRTS LK =MRS XY ;
C.
MRT XY =MRS XY ;
D.
(MRTS LK ) X =(MRTS LK ) Y 。
【单选题】正弦电流 i =6 sin ( 314 t +60 ° ) A 的有效值和频率为( )。
A.
6A  100Hz
B.
6 A  100Hz
C.
6A  50Hz
D.
6 A  50Hz
【单选题】已知一正弦交流i(t)=10sin(314t-π/6)(A),请求出正弦交流电的频率为 Hz.
A.
314
B.
50
C.
100
D.
100t
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