题目内容

【题目】听下面一段对话,完成五道小题,每小题填写一个词这段对话你将听两遍。

【答案】

(1)wrong

(2)3C56

(3)system

(4)special

(5)credit

【解析】听力原文:

W: Hello, Home & Office Supplies. Can I help you?

M: Yes, it's Thompson Electronics here. We have an account with you.

W: Oh, yes. How can I help?

M: We've just had some printers delivered, but they are the wrong ones.

W: Oh, dear. I do apologize for the mistake.

M: I don't know how you could have got it wrong. We order from you all the time.

W: I know. But unfortunately, we've been having a problem with our computer system.

M: Well, how can we sort this out?

W: Could you bear with me a moment please? Ah, yes, I have the order here. You want 25 HW3C56 printers. Is that correct?

M: Yes, that's right. But you sent us 25 HW56 instead.

W: I see. I'll sort it out right away and we'll post the order special delivery.

M: Thanks.

W: I'll put a $300 credit on your account to make up the inconvenience as well. Is that all right?

M: Oh, that's very nice. Thanks.

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【题目】某同学把附有滑轮的长木板放在实验桌上,将细绳一端拴在小车上,另一端绕过定滑轮,挂上适当的钩码,使小车在钩码的牵引下运动,以此定量探究绳拉力做功与小车速度变化的关系,此外还准备了打点计时器及配套的电源、导线、复写纸、纸带、小木块等。组装的实验装置如图所示。

(1)若要完成该实验,必需的实验器材还有哪些 ? _________________

(2)实验开始时,他先调节木板上定滑轮的高度,使牵引小车的细绳与木板平行,他这样做的目的是下列的哪个(

A.避免小车在运动过程中发生抖动

B.可使打点计时器在纸带上打出的点清晰

C.可以保证小车最终能够实现匀速直线运动

D.可在平衡摩擦力后使细绳拉力等于小车受的合力

(3)平衡摩擦力后,当他用多个钩码牵引小车时,发现小车运动过快,致使打出的纸带上点数较少,难以选到合适的点计算小车速度,在保证所挂钩码数目不变的条件下,请你利用本实验的器材提出一个解决办法:______________________________

(4)他将钩码重力做的功当作细绳拉力做的功,经多次实验发现拉力做功总是要比小车动能增量大一些,这一情况可能是下列哪些原因造成的

A.在接通电源的同时释放了小车

B.小车释放时离打点计时器太近

C.阻力未完全被小车重力沿木板方向的分力平衡掉

D.钩码匀加速运动,钩码重力大于细绳拉力

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