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สมรรถนะ　ของ　รถยนต์　คัน　นี้　เท่ากับ　รถ　แพง　ไหม　ครับ

สมรรถนะ　ของ　รถยนต์　คัน　นี้　เท่ากับ　รถ　แพง　ไหม　ครับ
Is the performance of this car equal to an expensive one?
From Lesson 354:On the contrary (ซะอีก)·Thai

Questions & Answers about สมรรถนะ　ของ　รถยนต์　คัน　นี้　เท่ากับ　รถ　แพง　ไหม　ครับ

สมรรถนะ is quite a mouthful. Is this word strictly for cars, or can it be used for a person's performance too?
สมรรถนะ (capability/performance) is typically used for machines, vehicles, or technical systems. For a person's work performance, you would usually use ผลงาน (work results) or ประสิทธิภาพ (efficiency) instead.
Why does the first car get the full รถยนต์ คัน นี้ (car + classifier + this) while the second car is just รถ แพง without a classifier?
The first car is specific (this car), which strictly requires the classifier คัน before the demonstrative นี้. The second car is speaking generally about an expensive car as a category, so the classifier is not grammatically necessary here.
What is the difference between using เท่ากับ (equal to) here instead of เหมือน (like/same as)?
เท่ากับ implies a measurable equality in level, amount, or statistics, which is perfect for comparing mechanical performance metrics. เหมือน just means things are similar in appearance, feeling, or general nature.
This lesson is about ซะอีก (surprisingly/on the contrary). How would I use it in a reply to this question if this car is actually better than an expensive one?
You would use it at the very end of your contrary statement to show the reality defies the speaker's expectations. For example, you could reply: ดีกว่า รถ แพง ซะอีก (It is better than an expensive car, actually!).

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