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[Data Sufficiency]
试题详情
题目：
Given a positive number N, when N is rounded by a certain method (for convenience, call it Method Y), the result is 10n if and only if n is an integer and 5 × 10 n – 1 ≤ N < 5 × 10n. In a certain gas sample, there are, when rounded by Method Y, 1021 molecules of H2 and also 1021 molecules of O2. When rounded by Method Y, what is the combined number of H2 and O2 molecules in the gas sample?
- The number of H2 molecules and the number of O2 molecules are each less than 3 × 1021.
- The number of H2 molecules is more than twice the number of O2 molecules.
选项:
A、Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B、Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C、BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D、EACH statement ALONE is sufficient.
E、Statements (1) and (2) TOGETHER are NOT sufficient.
答案:
C
提问：
请陆旭老师回答一下。题干中说氢气分子和氧气分子都是10的21次方，但是条件一又说氢气分子和氧气分子都小于3×10的21次方，那我该如何判断分子的具体数量？并且请老师再详细地讲一下这道题的具体做法，谢谢！
解答：
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阅读2299
提问：
请陆旭老师回答一下。题干中说氢气分子和氧气分子都是10的21次方，但是条件一又说氢气分子和氧气分子都小于3×10的21次方，那我该如何判断分子的具体数量？并且请老师再详细地讲一下这道题的具体做法，谢谢！
解答：
点赞1
阅读2300
提问：
没有思路
解答：
点赞1
阅读2298
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