在螺纹道钉硫磺锚固作业熔制硫磺锚固材料时，火源应设在离开钢轨（）外的下风方向。
A.2m
B.3m
C.4m
D.5m
参考答案：D
Alice has lived in China for many years, so she ___ the life here.
A．used to
B．get used to
C．become used to
D．has got used to
环型燃烧室特别适宜与（）压气机匹配。
