影响汽油安定性的根本原因是汽油中存在不安定组分,特别是不饱和烃,如二烯烃等。
参考答案:对
根据句意及所给首字母提示,写出单词
1. The girl was happy because her name was I in the real paper.
2. The instructions on the box are very c .I don't quite understand.
3. I like reading because books can lead me to the ocean of k____ .
4. If you are hungry, you had better find a r .
5. The food smells good but t terrible.
诊断早期肺炎球菌性肺炎,下列哪一项最有价值()。
A.白细胞总数及中性粒细胞均增高
B.痰培养肺炎球菌阳性
C.肺实变体征
D.X线见大片阴影呈肺叶或肺段分布
E.肺部湿啰音