题目内容
某人器自行车以速率V向正东方向行驶,遇到由北向南刮来的风,(设风速也为V),则他感到风是从东北方向吹来的。( )
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某质点的运动方程为 x=3t-5t3+6 (SI) ,则该质点作变加速直线运动,加速度沿X负方向。 ( )
物体的运动方向和合外力方向一定相同。 ( )
物体受到几个力的作用,一定产生加速度。 ( )
Fill in the blanks with the words given below. Change the form where necessary.citeexposure purchaseconflictrate primarily sophisticated inferior1 Buyers can now complete a____1____ within a day — down from the previous three.2 This process ought to be highly ____2_______.3 That is because an economy’s trend growth ___3___ cannot be measured directly.4 I’d like to __4___ my own experience as an example.5 If we see this_____5___ only from one side or the other, then we will be blind to the truth.6 Failure doesn’t mean you are ___6______ . It does mean you are not perfect.7 On top of this, social services, ____7____ health care and education, also need improvement.8 Skin doctors warn people to be careful with sun ___8_____.
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