水玻璃只能在空气中凝结硬化的水硬性胶凝材料。
A. 对
B. 错
Coca-Cola________________ (sold/provided) Coke in cans for the first time in 1955
In the 1930s, Hollywood studios________________ (manufactured/produced) over 50 classic films.
IBM________________ (managed/designed) some of the first personal computers.