1993年，化工学院副院长（）教授被载入《国际名人传记词典》。
A.王俊德
B.方志杰
C.吕春绪
D.潘婷
参考答案：C
漏电保护器的使用是防止（）
A.触电事故
B.电压波动
C.电荷超负荷
30. When he was only thirty years old, he had already experienced______most people only experience when they are much older.
A．what
B．which
C．who
D．When
