当瓦斯浓度达到()时遇高温热源会发生爆炸。
A.3%~5%
B.5%~16%
C.10%~20%
D.20%~30%
参考答案:B
Stop talking. I have __________ to tell you.
A.anything important
B.something important
C.important anything
D.important something
公共财政经济稳定和发展职能不包括()
A.充分就业
B.稳定物价水平
C.国际收支平衡
D.利率稳定