问题
选择题
已知地球上的陆地面积约为149000000 平方千米，用科学记数法表示地球上的陆地面积约为（ ）平方千米[ ]
A．1.49×108
B．1.49×109
C．14.9×108
D．14.9×109
答案
答案：A
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已知地球上的陆地面积约为149000000 平方千米，用科学记数法表示地球上的陆地面积约为（ ）平方千米[ ]
A．1.49×108
B．1.49×109
C．14.9×108
D．14.9×109
答案：A
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