题目内容
电气设备外绝缘体最低部位距地小于（ ）米时，应装设固定遮拦。
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Listening Task 5 Listen to the following passage three times and fill in the blanks with what you hear.When meeting someone for the first time, it is usual to 1. ____________ the person's right hand with your right hand. People who do not know each other generally do not kiss or hug when meeting. When you first meet someone, it is polite not to 2. ____________ personal matters.Many Australians look at the eyes of the people they are talking with. They consider this a sign of 3. ____________ , and an indication that they are listening. Do not stare at the person for a long time.You can address a new acquaintance using their title and 4. ________ . You may use their first name when they ask you to or use it in the 5. ____________ . In the workplace and among friends, most Australians tend to be informal and call each other by their first names.
若先导式溢流阀阻尼孔堵塞,该阀将( )。
以下属于气源装置核心元件的是( )。
一水平放置的双杆液压缸,采用三位四通电磁换向阀,要求阀处于中位时,液压泵保压,且液压缸浮动,其中位机能应选用( )。
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