碗扣式钢管脚手架第一层的立杆选择应为()。
A、1.8m
B、3.0m
C、3.0m和1.8m两种
参考答案:C
—What do we need to buy?
—We need__________. [ ]
A. two carton of milk
B. two cartons of milks
C. two cartons of milk
D. two carton of milks
南亚经济发展速度最快的国家是_________。