1987年通过的《蒙特利议定书》是保护( )的历史文件。
A．动物
B．植物
C．大气臭氧层
D．水
参考答案：C
236. Marine was very interested in _____ because her father is a famous _____ figure.
A．politics; politics
B．politics; political
C．political; politics
D．political; political
硫回收三级硫冷凝器E2404的空冷器A2401何时投用？何时切除？
