月球上对物体引力大约是地球上的1/6,若一宇航员在月球上称得重100N,当他回到地球上后重多少?其质量为多大?(g取10N/kg)
600N,60kg
Students in our school are not allowed _______ outside.[ ]
A. live
B. living
C. to live
D. lived