某工程发生质量事故，造成直接经济损失15万元，该质量事故属于( )事故。
A．一般
B．特别重大
C．轻微
D．重大
参考答案：D
_______ the gained knowledge, he made his new inventions one after another.[ ]
A. Owing to
B. According to
C. Due to
D. By
石蜡基原油，含挥发性轻物质（）
A、较多
B、较少
C、中和
