A.180° B.264°40´ C.360° D.720°
A.2 B.3 C.4 D.5
A.连接箱 B.螺栓 C.弹性支承 D.泵支撑箱
A.42°20´ B.84°40´ C.180°+42°20´ D.42°
A.42°20´ B.84°40´ C.180°-42°20´ D.42°