A:X可能是金属,也可能是非金属
B:X和Y位于同一周期时,只能形成一种物质
C:X和Y可能位于同一主族,也可能位于不同主族
D:化合物XY3溶于水,溶液可能显碱性,也可能显酸性
I bought a smartphone(智能手机) yesterday, and it works well, would you like to buy ________ like this?
新文化运动是近代中国的一次思想大解放运动,其“新”表现在( )
This is 3-D printer. And this is an artificial (人工的) ear. Can you believe that scientists printed this artificial ear by this 3-D printer?