螺栓联接因结构简单，装拆方便，而被广泛应用。
参考答案：对
Only after they had discussed the matter for several hours ________ a decision.
A．they reached
B．did they reach
C．they reach
D．do they reach
计算机的指令系统提供多种寻址方式，若操作数的地址在寄存器中，则称为 (60) 寻址。
A．寄存器直接
B．寄存器间接
C．直接
D．间接
