【单选题】下列各实验装置图的叙述中,正确的是
C.
以NH 4 Cl为原料,装置③可用于制备少量NH
D.
装置④从a口进气可收集Cl 2 、NO 2 等气体
【单选题】Mathilde and her husband turned the whole room upside down ________ the lost necklace.
【判断题】U.S. Treasury issues have no default risk.
【简答题】说一说1厘米、1平方厘米、1立方厘米分别是用来计量什么量的单位?它们有什么不同?
【单选题】Mathilde and her husband __ to work hard to pay off the debts.
【简答题】Mathilde's husband agreed to give her _______________.
【简答题】Mathilde's husband got ____________.
【判断题】Mathilde's friend is very poor.