如图,已知a12=65°,β2及β3的角值如图所示,试求2~3边的正坐标方位角及3~4边的反坐标方位角。
参考答案:
α23=95°10′,α43=260°30′
Annie was born ______ July 1996 in Beijing. [ ]
A. on
B. in
C. at
D. for
R13制冷剂适用于()装置。
A.单级压缩式制冷
B.双级压缩式制冷
C.蒸汽喷射式制冷
D.复叠压缩式制冷