有8种物质：①甲烷；②乙烯；③苯；④聚乙烯；⑤丙炔；⑥环己烷；⑦邻二甲苯；⑧环已

施工企业与施工项目经理之间的代理关系是一种（）代理。

A．委托

B．法定

C．指定

D．再次

消化道发生溃疡用H₂受体拮抗剂治疗时联用的是（）

A．丹参注射液

B．四逆散

C．炙甘草汤

D．六味地黄丸

E．香连化滞丸

TCP/IP (71) layer protocols provide services to the application (72) running on a computer. The application layer does not define the application itself, but rather it defines (73) that applications need — like the ability to transfer a file in the case of HTTE In short, the application layer provides an (74) between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols, with HTTP being only one of those. The TCP/IP (75) layer consists of two main protocol options — the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).

A. application B. sessionC. physical D. transport

县级以上人民政府公安机关，经上级公安机关或同级人民政府批准，对严重危害社会治安秩序的突发事件，可以根据情况实行现场管制。 ( )

哮喘SMART治疗的缓解治疗是（）

A.口服SABA

B.prnSABA

C.维持吸入信必可

D.prn信必可