A:Th元素的质量数是232
B:Th 元素的相对原子质量是231
C:232Th 转化成 233U是化学变化
D:230Th和 232Th的化学性质相同
夜间觉察到有煤气中毒的危险时,应采取的措施正确的是( )
(2016•十堰)- I shouted to you at the gate, but you didn't hear me.
- Really? I ____ a telephone call to my mother.
下列加下划线字注音全都正确的一项是( )