【多选题】ChemDraw结构式与Chem3D模型的转换方式有( )。
【单选题】______, as the chemical extinguisher agent, should be used for an electric fire.
C.
carbon dioxide or foam
D.
carbon dioxide or dry chemical
【单选题】制作亚光不锈钢材质,使其产生亚光效果,调节的是哪一项参数?
【单选题】What do you think most slaves thought about living and working on ranches?
A.
They liked it so much they were going to find others to bring back.
B.
They were unhappy and wanted to leave.
C.
They wanted to buy slaves and start ranches of their own.
D.
They were happy to work there.
【单选题】在使用Chem3D进行化工过程模拟中要设置工程单位。Chem3D内置了几种工程单位集?
【单选题】Most ranches are ___________ in flat open country.