不交轴光线受光角
skew rays acceptance angle
X射线光子光谱法
X-ray photon spectroscopy
X射线光子光谱学
X-ray photon spectroscopy
军事缆线受光角
mitiltary cable acceptance angle
本初子午线
zero meridian
Prime (Greenwich) meridian
prime meridian
Greenwich (Prime) meridian
the prime meridian
the first meridian