矿物的力学性质有鉴定意义的主要有矿物的（）、（）和（）。
参考答案：硬度；解理；断口
Do you think that the bridge _________ in a year?
A． would be completed
B． will be completed
C． had been completed
D． is being completed
制作模具应属于典型的( )。
A．大量生产
B．成批生产
C．单件生产
D．备货生产
