地面上有A、B、C三点,已知AB边的坐标方位角ABB=35°23′,测得左夹角∠ABC=89°34′,则CB边的坐标方位角CBB=()。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧