下面各项指标中,()与建筑石膏的质量等级划分无关。
A.强度
B.细度
C.凝结时间
D.未消化残渣含量
参考答案:D
食物链加环时应遵循的原则。
The meat you bought last week () terrible. It () bad.
A.smells; must go
B.smells; must have gone
C.is smelt; must go
D.is smelt; must have gone