军用卫星按用途可分为侦察卫星、海洋监视卫星、（）。
A.军用通信卫星
B.导航卫星
C.气象卫星
D.测地卫星
参考答案：A, B, C, D
around the famous museum, we were taken to visit the Theme Park about five kilometers out of the city.
A．Having shown
B．Being shown
C．To be shown
D．Having been shown
轧槽是什么？
ng shown