挑战习题
1/5单选题
难度:

1.据测算,我国每天因土地沙漠化造成的经济损失约为1.5亿元,一年的经济损失约为54750000000元,用科学记数法表示这个数为(  )
A
B
C
D
提示1:
IOenkeWtpuiusOaVsOazleeahOihqOekuuW9ouW8j+S4umHDlzEwPHN1cD5uPC9zdXA+55qE5b2i5byP77yM5YW25LitMeKJpHxhfO+8nDEw77yMbuS4uuaVtOaVsA==
提示2:
IOehruWumm7nmoTlgLzvvJrljp/mlbDnmoTmlbTmlbDkvY3mlbAtMe+8jG49MTEtMT0xMA==
正确答案:Qg==
PGRpdj7op6PvvJrnp5HlraborrDmlbDms5XnmoTooajnpLrlvaLlvI/kuLphw5cxMDxzdXA+bjwvc3VwPueahOW9ouW8j++8jOWFtuS4rTHiiaR8YXzvvJwxMO+8jG7kuLrmlbTmlbA8L2Rpdj48ZGl2PuehruWumm7nmoTlgLzvvJrljp/mlbDnmoTmlbTmlbDkvY3mlbAtMe+8jG49MTEtMT0xMDwvZGl2Pg==