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世界煤储量在世界能源总储量中占90%，按目前规模可持续开采200年左右。据19世纪80年代初世界能源会议等组织的资料，世界煤资源地质储量为14.3万亿吨，其中探明储量为3.5万亿吨，约占24.5%；在总储量中硬煤占75%，褐煤占25%。按硬煤经济可采储量以美国、俄罗斯、中国最为丰富，分别占世界总量的24.8%、21.5%、19.6%，共占三分之二。在世界煤炭资源地质储量中，未探明储量占总储量的：A.25.1%
B.74.9%
C.75.5%
D.25%
硬煤经济可采储量占世界总量比例最高的国家是：A.美国
B.中国
C.俄罗斯
D.都不是
在世界煤炭总储量中，硬煤大约有：
A.9.84万亿吨
B.10.73万亿吨
C.3.58万亿吨
D.14.3万亿吨
中国的硬煤占世界能源总储量的：
A.19.6%
B.16.7%
C.13.2%
D.14.7%
在世界煤炭总储量中，硬煤的储量比褐煤的储量多：
A.7.15万亿吨
B.3.58万亿吨
C.10.73万亿吨
D.6.78万亿吨
请帮忙给出每个问题的正确答案和分析，谢谢！

A.3万亿吨，其中探明储量为3.5万亿吨，约占24.5%；在总储量中硬煤占75%，褐煤占25%。按硬煤经济可采储量以美国、俄罗斯、中国最为丰富，分别占世界总量的24.8%、21.5%、19.6%，共占三分之二。
B.25.1%
B.74.9%
C.75.5%
D.25%
硬煤经济可采储量占世界总量比例最高的国家是：A.美国
B.中国
C.俄罗斯
D.都不是
在世界煤炭总储量中，硬煤大约有：
A.9.84万亿吨
B.10.73万亿吨
C.3.58万亿吨
D.14.3万亿吨
中国的硬煤占世界能源总储量的：
A.19.6%
B.16.7%
C.13.2%
D.14.7%
在世界煤炭总储量中，硬煤的储量比褐煤的储量多：
A.7.15万亿吨
B.3.58万亿吨
C.10.73万亿吨
D.6.78万亿吨

【参考答案】

问题 1 解析：C
由题干“未探明储量占总储量的多少”，可判定本题为现期比重问题。根据材料中所给探明储量占总储量......

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