Abstract: Disclosed in the present disclosure are a heterocyclic derivative represented by formula (I), or a stereoisomer, a pharmaceutically acceptable salt thereof. The heterocyclic derivative or the stereoisomer thereof has high HCMV inhibiting activity, which is increased in potency by 8-40 folds compared with letermovir, and clinically it may provide better protection for patients suffering from HCMV infection after allogeneic hematopoietic stem cell transplantation, kidney transplantation, and lung transplantation.

Abstract: A rapid construction method for a secondary lining of a small-section tunnel includes steps of: transporting and store secondary lining steel bars to a designated position in the tunnel with a steel bar transport vehicle and a wheel type dump truck; after the tunnel is cleaned, simultaneously constructing the secondary lining from two ends to a middle of the tunnel; constructing a lower inverted arch with a customized inverted arch formwork and then constructing an upper arch wall with a plurality of portal arch wall formwork trolleys; wherein the portal arch wall formwork trolleys form a set, and are connected by hinges, so as to construct in a curve tunnel. The rapid construction method has a long single construction section, and procedure connection is compact, thereby realizing rapid and efficient construction of the secondary lining.

Abstract: A rapid construction method for a secondary lining of a small-section tunnel includes steps of: transporting and store secondary lining steel bars to a designated position in the tunnel with a steel bar transport vehicle and a wheel type dump truck; after the tunnel is cleaned, simultaneously constructing the secondary lining from two ends to a middle of the tunnel; constructing a lower inverted arch with a customized inverted arch formwork and then constructing an upper arch wall with a plurality of portal arch wall formwork trolleys; wherein the portal arch wall formwork trolleys form a set, and are connected by hinges, so as to construct in a curve tunnel. The rapid construction method has a long single construction section, and procedure connection is compact, thereby realizing rapid and efficient construction of the secondary lining.

Abstract: In a method for end-to-end link detection, a link state of a first network device is bound to a reliability detection mechanism session established between the first network device and a second network device, and the first network device detects the link state of the first network device and notifies the second network device of the link state of the first network device through the reliability detection mechanism session. In a method for policy routing switching, the second network device records received link state information of the first network device, configures a relation between a policy routing and a link. The second network device determines a link corresponding to a selected policy routing, and switches a policy routing according to the state of the link. Apparatuses corresponding to the methods also provided. The methods and apparatuses can implement the end-to-end link detection, and initiate switching in time.