流水施工的时间参数包括( )。
A．流水节拍
B．流水段数
C．流水步距
D．工期
E．施工过程数
参考答案：A,C,D
量取5mL硫酸，最好选用的仪器是（ ）
A．50mL量筒
B．100mL量筒
C．托盘天平
D．10mL量筒
— Mum, I want ____ of these two coats.
— Sorry. You can only buy one of them. [ ]
A. one
B. all
C. some
D. both
