问答题

He closed his eyes for the knife to fall. Just at that moment, a giant of a man dressed as a monk jumped out from behind the tree.

答案： He closed his eyes for the knife to fall. Just at that momen...

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某一固体，在 298.15K 和常压下发生升华，这意味着（）

A、固体比液体密度大些
B、三相点的压力大于常压
C、固体比液体密度小些
D、三相点的压力小于常压

单项选择题

Two blocks with different mass are attached to either end of a light rope that passes over a light, frictionless pulley that is suspended from the ceiling. The masses are released from rest, and the more massive one starts to descend. After this block has descended 1.20 m, its speed is 3.00 m/s. If the total mass of the two blocks is 15.0 kg. The mass of the more massive block is _____(kg).(g=9.8m/s^2, round to one decimal place)

A.20
B.00
C.0
D.(g=9.8m/s^2,