碳氢链接的长度
参考答案：
离子型表面活性剂碳氢键的碳原子数通常在8～16的范围内，其水溶液的临界脐束浓度随碳原子数增加而降低。
I was close to being killed the day before yesterday. A truck passed me at ______ I thought was a crazy speed.
A．as
B．which
C．what
D．that
远交近攻
