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【判断题】
由于机械波是由机械振动产生的,所以波长等于振幅。A.
正确
B.
错误
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【简答题】regret , assistant , complaint, look into , situation , compete turn a deaf ear to , instead , look forward to , cooperate , balance 1. We’ve received too many letters of ____________ this month.
【简答题】regret , assistant , complaint, look into , situation , compete turn a deaf ear to , instead , look forward to , cooperate , balance 6. In this ________, it is very easy to get scared.
【简答题】色彩的()是色彩本身受到其它色彩影响而产生的与原来看时不一样的感受的现象
【单选题】轴的直径为f300mm ,其轴线的直线度公差在图样上的给定值为f0.01
A.
,则直线度公差的最大值可为( )。
B.
f0.01mm
C.
f0.02mm
D.
f0.03mm
E.
f 0.04mm
【简答题】regret , assistant , complaint, look into , situation , compete turn a deaf ear to , instead , look forward to , cooperate , balance 7. They know the importance to keep the ________ of the team.
【简答题】regret , assistant , complaint, look into , situation , compete turn a deaf ear to , instead , look forward to , cooperate , balance 5. You could have offered a smile; ______ you chose to keep silence...
【简答题】regret , assistant , complaint, look into , situation , compete turn a deaf ear to , instead , look forward to , cooperate , balance 4. When receiving a complaint letter, the manager should _______ th...
【简答题】regret , assistant , complaint, look into , situation , compete turn a deaf ear to , instead , look forward to , cooperate , balance 2. They prefer to _________ rather than ______ with their teammates...
【简答题】阅读下面一段文字,完成第8—10题。。 围棋与国家 林建超 1围棋起源于中国,是黄河文明的产物,其形制弈法等都饱含着文明母体的基因和特征。围棋极可能源自上古时期的结绳而治、河图洛书和周易八卦,因为其形制、内涵与中华文明的源头相符。 2围棋的产生和发展,始终与弈者对自然、社会和人生的思考感悟联系在一起。围棋不仅对个人修身养性,而且对民族社会的群体心理产生深刻影响。围棋是中华五千年文明的象征、民族文化...
【简答题】设用图示的压榨机来压榨弹性体4，已知每压入1mm需10N的力，球B与B'分别重160N，球心离轴线的距离为300mm，其臂及螺旋的重量及惯性均略去不计。方牙螺旋的平均直径为44mm，螺距为20mm，摩擦因数f=0.08，止推球轴承处的摩擦不计，平板C重量为100N，如物体A需压缩100mm，且无附加能量加至机构中，求在压缩开始瞬时，球B必须具有的角加速度。
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