| 1. | for example, can be butane or isobutane.
例如可以是丁烷或异丁烷。 |
| 2. | Cyclobutane exists predominantly in a "butterfly" conformation .
环丁烷主要成“蝶式”构象存在。 |
| 3. | This phenomenon does not occur with 1-2-dimethylenecyclobutane .
在1，2--二亚甲基环丁烷中并不发生这种现象。 |
| 4. | Butanes and butenes can be maintained in the liquid states at ambient temperature under quite moderate pressure .
在适当的大气压力及常温下，丁烷和丁烯均可保持液体状态。 |
| 5. | cyclobutane exists predominantly in a "butterfly" conformation, in which the dihedral angle between the two wings is about 20°。
环丁烷主要成“蝶式”构象存在，其中两翼间的二面角大约为20。 |
| 6. | Specification for commercial butane and commercial propane
商业用丁烷和丙烷规范 |
| 7. | Who would have blown up an airplane
.根据fbi ，如果当时他有一个丁烷火机 |
| 8. | Propan butan gaslamps ; requirements and testing
丙烷丁烷煤气灯.要求和检验 |
| 9. | Standard specification for isobutane thermophysical property tables
异丁烷热物理性能表 |
| 10. | Standard specification for normal butane thermophysical property tables
正丁烷热物理性能表 |
