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【单选题】
Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer. 听力原文：M: If the traffic wasn't held up for so long, I would have been to class by ten o'clock. W: It's tm bad you didn't make it. The professor was looking for you all morning. Q: What happened to the man? (12)A.
He didn't go to work this morning.
B.
He was injured and had to go to the hospital.
C.
He talked with the professor in the morning.
D.
The traffic delayed him.
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【单选题】关于冲压设备的选择，以下说法 不正确。
A.
压力机的选择包含压力机类型和规格两项内容的选择。
B.
开式压力机操作方便，但因为结构刚性较差，适合中小型尺寸的模具。
C.
闭式压力机因为刚性好，适合较大型尺寸和冲压力较大的模具使用。
D.
只要压力机的公称压力能够满足模具的冲压力需要，就可以选用这台压力机。
【多选题】关于密闭罩的特点，下列说法正确的是________。
A.
局部密闭罩适用于产尘气流速度小，瞬时增压不大，且集中、连续扬尘的地点
B.
局部密闭罩的特点是密闭罩本身为独立整体，易于密闭
C.
大容积密闭罩的特点是罩内容积大，可以缓冲含尘气流，减小局部正压
D.
整体密闭罩将产生灰尘的设备或地点大部分密闭，设备的传动部分留在外面的密闭罩
【简答题】现在我国正在建设资源节约型社会，国家在开展全民节约活动，我们应该怎么做?
【单选题】关于变电站噪声的控制，下列说法不正确的是：( )
A.
在变压器、电抗器安装过程中，通过在器身和箱底之间加装缓冲隔振装置，可以减少铁芯振动向其它器件的传递，从而降低噪声;
B.
在变压器、电抗器运行过程中，由于直流偏磁影响出现噪声偏大情形时,应消除直流偏磁以减小噪声
C.
将站内高大建筑物布置在主要噪声设备与站外声环境敏感目标之间，可减小噪声对外环境影响
D.
变电站规划选址时，尽量选择对声环境质量要求较高的区域
【单选题】在这样特殊的时期,作为大学生,现阶段我们应该做什么呢?
A.
Go out to do exercise in the morning
B.
Stay at home and proceed online learning
C.
Get together with friends
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