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【单选题】
听力原文：W: United Development Company. May I help you? M: I'd like to speak to Mr. Hailer, please. W: Who shall I say is calling, please? M: This is Mr. Dewey from the IM Company. W: I'sorry, Mr. Dewey, but Mr. Halley is not in at the moment. M: When will he come in, do you know? W: I suppose he won't be in until 12: 00. M: May I leave a message? W: Certainly. M: Please ask him to give me a call as soon as he returns. He has my number. W: Very well, Mr. Dewey, I'll do that. M: Thank you. Bye-bye. 8．How does the conversation take place? 9.When will Mr. Halley be in? 10.What does the man ask Mr. Halley to do? (8)A.
By the radio.
B.
On the phone.
C.
Between two friends.
D.
In a restaurant.
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【简答题】在图2.4.7(a)所示TTL门电路中，已知OC门输出管截止时的漏电流I OH ≤100μA，输出管导通时允许通过的最大负载电流I LM ≤15mA，输出Y的高低电平分别为V OH ＞3V，V OL ≤0.4V；已知G 1 ～G 5 门的输入特性如图2.4.7(b)所示。
【多选题】变速器空挡时异响的原因有:
A.
安装时,曲轴与变速器第一轴中心线不同心
B.
第二轴前轴承磨损、污垢、起毛
C.
第一轴轴承损坏
D.
倒挡常啮合齿轮磨损,断齿,倒挡轴与轴套磨损松旷
【单选题】导致变速器处于空挡时有异响,踩下离合器踏板时响声消失故障的原因是( )
A.
变速器直接挡同步器齿毂啮合松旷
B.
离合器从动盘花键松旷
C.
变速器常啮合齿轮啮合间隙过大
D.
变速器一倒挡齿轮啮合间隙过大
【简答题】碾轮式混砂机中刮板的作用是对型砂进行()和 松散 。
【单选题】导致变速器处于空挡时有异响,踩下离合器踏板时响声消失故障的原因是( )
A.
变速器直接挡同步器齿啮合松旷
B.
离合器从动盘花键松
C.
变速器常合齿轮啮合间隙过大
D.
变速器一倒挡齿轮合间过大
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