6.A【解析】在空间站里小环和小球均处于完全失重状态,整个系统沿直杆方向动量守恒,系统初动量为mv-Mv=0,则有mx1=Mx2,x1 x2=L,联立解得x1=0.3m,A项正确。
1.has remained 2. slayed 3.felt 4 have paid5. arrives 6.hadnt seen 7 be heard8 will be covered 9. was working 10.suitsllhad expected 12 have been saved 13 were moved14is being widened 15 will become 16 is doing17 had been taught 18 has been regarded19 is spending 20 is allowed
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