干砂适合用于扑灭下列()种火灾
A.钠和钾等金属火灾
B.液体火灾
C.带电火灾
D.固体物质火灾
参考答案:A
In relation to the dismissal of employees, describe the circumstances when the following may occur:
(b) Dismissal for misconduct; (3 marks)
石油的元素组成中,()和氢H所占的比例约为96%~99.5%。
A.镍(N)
B.氧(O)
C.硫(S)
D.碳(C)