教师要“教书育人，为人师表”；医生要“救死扶伤，治病救人”；以上职业道德规范体现的特

支持性心理护理

CRH3型动车组撒沙装置一级修标准是（）

A.撒砂装置无明显机械损伤，各零部件齐全、安装牢固无松动

B.撒沙装置吊装安装牢固，无丢失

C.各部螺栓安装牢固，防松标记不错位

D.撒砂装置喷嘴距轨面高度符合限度规定

穿（跨）越管线强度试压、严密性试验有何要求？

在高原、高空环境下，只要吸入气PO₂大于60mmHg，Hb氧饱和度仍可达

A．60%～70%
B．70%～80%
C．80%～90%
D．90%以上

Both bus and tree topologies are characterized by the use of multipoint (71) ．For the bus，all stations attach，through appropriate hardware (72) known as a tap，directly to a linear transmission medium，or bus．Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the (73) ．A transmission from any station propagates the length of the medium in both directions and can be received by all other (74) ．At each end of the bus is a (75) ，which absorbs any signal，removing it from the bus．

A．medium
B．connection
C．token
D．resource