用于高速公路沥青路面上面层和中面层沥青混合料的动稳定度为( )次/mm。
A．
B．
C．
参考答案：B
The workers _____busily when the boss came to look for something she ______in the office.
A had worked, had left B were working ; had left C working ; had left D had worked; left
发生于小儿的是
A．颅前窝骨折B．开放性骨折C．线形骨折D．生长性骨折E．颅中窝骨折
