Of these, heptane with 7 carbons causes undesirable engine knocking, so refiners try to blend in more smooth-burning octane with 8 carbons.
7个碳的庚烷引起不明原因引擎抽风。炼油厂尝试混入更多的8个碳的辛烷。
There are bubbles in the burning-resisting viscose fiber and it has smooth vertical structure .
在难燃粘胶纤维里面有气泡，其具有较明显的光滑平整纵向结构；
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