建筑基线上的基线点应不少于（）。
A.1个
B.2个
C.3个
D.4个
参考答案：C
— What _____ you usually have for breakfast?
— _____ and a cup of coffee. [ ]
A. do, Three bread
B. do, Three pieces of bread
C. are, Three breads
D. are, Three piece of bread
主要通风机的弹性偶合器胶皮圈外径与孔径差不大于（）mm。
A、1
B、2
C、3
D、4
