问题
选择题
The train will arrive _____________ New York at 10: 00.[ ]
A. on
B. at
C. of
D. in
答案
答案：D
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The train will arrive _____________ New York at 10: 00.[ ]
A. on
B. at
C. of
D. in
答案：D
，则其化学式为______，其碳、氢和氧元索的最简质量比为______，其含氧元素的质量分数等于______．