一个正方形周长是200米,边长是______米.
100÷4=20(米);
答:边长是20米.
故答案为:20.
Look ! The building which _________now will be used as a library.
A.is being built
B.to be built
C.is built
D.being built
葡萄糖注射液中的特殊杂质是
A.对氨基酚
B.还原糖
C.去甲基安定
D.颠茄碱
E.5-羟甲基糠醛