舌色白如镜者属（） A.气虚 B.胃阴虚 C.营血大虚 D.阳气虚衰 E.痰浊未化

架棚支护施工中不得使用什么支护材料及支架？

检测空肠弯曲菌的食品的运送和保存需用（）。

A.SIM半固体

B.三糖铁培养基

C.Cary-Blaier半固体

D.营养琼脂

E.保种半固体

若使用Windows系统，用哪个实用程序检查包从发送计算机到目标计算机所经过的路径（）

A.tracert

B.traceroute

C.ping

D.trace

“备案号”栏应填（）。

A．B22021345228

B．B22021345778

C．TIM191938

D．8GUF290

An airline passenger is planning a trip that involves three connecting flights that leave from Airports A, B, and C, respectively. The first flight leaves Airport A every hour，beginning at 8:00 a.m., and arrives at Airport B  hours later. The second flight leaves Airport B every 20 minutes, beginning at 8:00 a.m., and arrives at Airport C  hours later. The third flight leaves Airport C every hour, beginning at 8.45 a.m. What is the least total amount of time the passenger must spend between flights if all flights keep to their schedules ？