气体充装注册登记证有效期为( )年。
A.3B.5C.2D.6
参考答案:B
— You ____ me such a bad quality coat. Obviously, you are cheating me.
— So what? No one forced you to buy it. [ ]
A. are selling
B. sold
C. have sold
D. had sold
启动氮气加热器E-2114应满足哪些逻辑条件?