kurisuchan kagaku chuushinbosuton massa-

$B$/$j$9$A$c$s(B $B$+$,$/(B$B$A$e$&$7$s(B
$B$\$9$H$s(B $B$^$C$5!<$A$e$;$C$D(B

$B$$$7$,$D(B 2000

$B!!(B