城市轨道交通乘务员一般是指 ，主要工作是从事城市轨道交通电动列车的驾驶、应急故障处理，部分城市的电动列车驾驶员还担当电动列车在检查、维修、调试等过程中的列车操纵作业。
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Which one of the following expressions can be used to introduce the important participants in a business meeting?
A. Good morning, everyone. If we are all here, let's get started.
B. Make sure everyone is here. Let's call the meeting to order.
C. First of all, please join me in welcoming Mr. Wilson from Nilson Company.
Which one of the following expressions can be used to state the principal objectives of the meeting?
Also present at the meeting are the director and the technical manager of our factory.
B. Our main aim today is to discuss some details of the contract.
C. The presentation will take about one hour.
Which one of the following expressions can be used to give control to the next speaker?
A. I'd like to hand over to Samantha, who is going to lead the next point.
B. There are 4 items on today's agenda.
C. I've called this meeting in order to draw up the sales plan of next year.
一端固结一端铰接的梁转动刚度为 ( ) 。
A. 3i
B. 4i
C. i
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