压力容器的安全状况分为五个等级,5级的安全状况最好。
参考答案:错
I like reading. I often go to . Which is NOT RIGHT?
A.the Reading Club
B.the library
C.the bookshop
D.the school hall
24V逆变器的供电电压是()伏。
A、DC1500;
B、AC400;
C、DC110;
D、DC24;