后张法预应力钢绞线断丝或滑丝限制为每束（）根。
A.3
B.2
C.1
D.0
参考答案：C
—lt is said that we will have another examination next week.
—Really? __________,we must begin to prepare right now. [ ]
A. If so
B. If possible
C. If not
D. Otherwise
我国税收的性质是（ ）
A．效率优先、兼顾公平
B．权利与义务相统一
C．依法纳税
D．取之于民，用之于民
