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【单选题】
分子中同时含有1°,2°,3°和4°碳原子的化合物是A.
2,2,3-三甲基丁烷
B.
2,2,3-三甲基戊烷
C.
2,3,4-三甲基戊烷
D.
3,3-二甲基戊烷
E.
2,2,3,3-四甲基丁烷
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A.
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B.
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C.
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D.
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A.
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B.
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A.
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B.
将作用于简支梁中部的集中荷载改为分布荷载
C.
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D.
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