The Japanese Emperor has made a rare televised address to his disaster-stricken country, and_____ his deepest concern about the dangerous situation at the nuclear power plant, calling for people to overcome hardship.

A．conveys

B．delivers

C．possesses

D．accounts

箕斗提升的井口煤仓应装设（）保护装置，仓满时能（）或自动断电。