如图是表示物质分子的示意图,图中“●”和“○”分别表示两种含有不同质子数的原子,则图中表示单质的是( )
A.
B.
C.
D.
答案:A
改错。
( ) 1. What do you usually do in Wednesday morning? _______________
A B C
( ) 2. She don't like it. _______________
( ) 3. What shall we doing? _______________
( ) 4. Let's goes to the movie theater. _______________
( ) 5. It's two far away. _______________
Shenton线是指()
A.髂前下棘下方髂骨外缘与股骨颈外缘的连线
B.闭孔上缘与股骨颈内缘的连线
C.自股骨大转子顶端向股骨干线引的垂线
D.自髂臼顶外端向"Y"形软骨连线引的垂线
E.闭孔上缘与股骨颈外缘的连线