【单选题】光从真空射入某透明介质中,入射角为60度,折射角为45度,则该介质临界角的正弦值为
【单选题】The General Manager held a dinner party at the International Hotel _______ the foreign guests.
【判断题】槽后是冷平流。槽后对应着大范围辐散下沉运动区和晴朗天空。
【判断题】西风带中的槽后是冷平流。槽后对应着大范围辐散下沉运动区和晴朗天空。
【多选题】工作在OSI参考模型的网络层的设备有()
【单选题】The manager told Ann to _____ a party to welcome the foreign guests to their company the following week. [ ]
【单选题】I told the foreign guests that it was in the house ______ we used to live that the exhibition was held.
【单选题】After the foreign guests got ____ with the Chinese traditional festivals, they liked to live in China.
【多选题】工作在OSI参考模型的网络层的设备有( )。