为什么 Which of the following is an SI unit 中用an

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为什么WhichofthefollowingisanSIunit中用an为什么WhichofthefollowingisanSIunit中用an为什么WhichofthefollowingisanSI

为什么 Which of the following is an SI unit 中用an
为什么 Which of the following is an SI unit 中用an

为什么 Which of the following is an SI unit 中用an
因为s的发音是【es】,元音开头

因为an后面的那个发言是元音