A.1/2倍 B.1/3倍 C.1/4倍 D.1/6倍
A.1.17U2φcosα B.2.34U2φcosα C.1.17U2φsinα D.2.34U2φsinα
A.1倍 B.1/2倍 C.1/3倍 D.1/6倍