尿培养标本的采集时机是什么？
参考答案：
宜为抗菌药物使用前的清晨第一次尿液。
After living there for one year, they have _________there.
A．accustomed to working
B．accustomed to work
C．been accustomed to working
D．been accustomed to work
WK-20型挖掘机传动机构稀油润滑采用分散油池（）循环润滑系统。
