We ________ our teeth in the morning.[ ]
A. comb
B. brush
C. clean
答案:B
什么是联轴器?本车间气压机联轴器轴向最大补偿量是多少?
心脏右前斜位,摄影的角度是
A.45°~55°
B.56°~65°
C.66°~70°
D.71°~80°
E.81°~85°