A.a(chǎn)=25° B.a(chǎn)=29° C.a(chǎn)=31° D.a(chǎn)=33°
A.γ1>γ2,φ1>φ2 B.γ1>γ2,φ1<φ2 C.γ1<γ2,φ1>φ2 D.γ1<γ2,φ1<φ2