Introduced over twenty examples of keep-space mechanism in compound parts of injection mold, Illuminated position and size and function of keep-space mechanism incompound in injection mold, and the effect to quality of mold and production.

Based on those experiences the refuge space is considered as a way to solve safety problems in underground space with large floor areas or huge depth.

According to the problem of thermal stability checking of overhead grounding wire in Beijing power network, it is pointed out that the section of overhead grounding wire is selected based on total short - circuit current of the line, which has some shortcomings.

Host-seeking behaviors of Aedes albopictus after treatments with spatial repellents at a certain concentration for given time were studied.