橡胶绝缘用具储存有何规定？
参考答案：
橡胶绝缘用具应放在避光的柜内，并撒上滑石粉。
That night when I called home, Jeanine was very ________ that the penguin had disappeared. [ ]
A．confused
B．fearful
C．upset
D．doubtful
下列何种大气污染物可致呼吸系统炎症和肺水肿
A．氯化钠
B．二氧化硫
C．石棉
D．二氧化硅
E．氯化钾
