石膏是以______为主要成分的气硬性胶凝材料。
参考答案:CaSO4
Sedative-hypnotic drugs are used to treat which of the following problems
A. Hallucinations and delusions.B. Anxiety and insomnia.C. Obsessive-compulsive disorder (OCD).D. Attention deficit hyperactivity disorder (ADHD).
I can’t it in English because I can’t English.Can I you the story in Chinese?
A.speak; say; tell
B.say; speak; tell
C.tell; speak; say
D.say; tell; speak