若3（2a﹣3b）2+2|5b﹣2c|=0，则a：b：c=_________．
3：2：5
With the help of the soldiers, many people ______ in the ruins were saved.
A．trapping
B．having trapped
C．to be trapped
D．trapped
某种病毒近似于球体，它的半径约为0.00000000495米，用科学记数法表示为 米．
