无保温措施的生活污水管道或水温与生活污水接近的工业废水管道,管底于设在冰冻线以上______m。
A.0.10 B.0.15 C.0.20 D.0.25
参考答案:B
I called Hnnah many times yesterday evening, but I couldn’t get through. Her brother _____on the phone all the time!
A.was talking
B.has been talking
C.has talked
D.talked
固定桥的咬合力主要是通过哪个部分传递到颌骨上()
A.固位体
B.桥体
C.连接体
D.基牙
E.黏膜