ns.m $# s 7it
44 14 44~-44-
m
15-2 ^tt/aiujsmii SI 5-3
4.
90°, jiM90°o
5-4)o
5. ±iJp;i^1?Ffci^( )
#EHi- ^hil0#jS^l?S-?fMW^a(3O°~45°)^;S^1?ls^4^'hM9O°,
?M90°o
5-5)?
?? 1. r r-
J SI 5-5 ,^
15-4 $#irtjfiimii l^TJ^hJl60°~90°, 97
6. ±iiR;a^1?7]c¥^'hM($#M)
,t##{4; m\~itL,