题目内容

You will hear a telephone conversation between a caller and a receptionist.Listen and complete the telephone message by filling in the blanks. Write only ONE word or number for each blank.You will hear the conversation TWICE.Task 2You will hear a man talking about types of call services provided by a hotel.Listen and complete the note by filling in the blanks. Write only ONE word or number for each blank.You will hear the talk TWICE.[音频]

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Task 1You will hear a conversation between a boss and a secretary.Listen and complete the message by filling in the blanks. Write only ONE word or number for each blank.You will hear the conversation TWICE.Task 2You will hear a weather forecast of several cities in China.Listen and complete the note by filling in the blanks. Write only ONE word or number for each blank.You will hear the talk TWICE.[音频]

湿空气中水蒸气的质量与干空气的质量之比，称为，湿空气中水蒸气分压与同温度下水蒸气饱和压力之比，称为。

自锁是利用接触器的什么部分？

A. 线圈
B. 主触头
C. 辅助触头

使用Y-Δ减压启动的电动机在正常运行时，电动机定子绕组是（）连接的。