or I want to know if XXXX@X=F is possible on the thin-walled cylindrical tube(and which is D whistle).
Thanks. 
I just tried on various whistles and none were even close.
You’d do better to learn how to half hole. It comes in useful many times and is really not difficult at all. There are several different techniques (rocking the finger up off the hole, sliding the finger back towards your palm, rolling the finger up towards the mouthpiece, etc). With a bit of practice you’ll be able to play nice Cnat, Fnat, Bb,Eb,etc. Well worth the practice!
A bit of experience in flute building makes me inclined to say that this is probably not possible. If it is, the F would be very weak, likely quite sharp, and the whistle would not be very loud over all. They did this on baroque flutes, but it’s not exactly with loads of success. F was always a problem on D flutes before they just made a gall durn key for it.
Now that… is an idea! Get out the sodering Iron!! 
Nope, it’s not possible… you need a thumb hole for F natural on a D whistle.
Thank you all!!
I don’t have any trouble with half-holing F,but I just wanted to know the possibilities.
You know,I just remembered that it’s possible on traversos(I havent played them for years,so I am not so sure of the fact now though,um,ninjaaron said it already heh).
Just as a reference,the final fingering chart of my tube exclusively for half-holers.
XXXXXX= D
XXXXXh=#D
XXXXX@=E
XXXX@@=F
XXXh@@=#F
XXX@@@=G
XXh@@@=#G
XX@@@@=A
Xh@@@@=#A
X@@@@@=B
@XX@XX=C
@@@XXX=#C
On 2nd octave
XXXX@@=C
XXXh@@=#C
On 3rd octave
XXX@@@=D
XXh@@@=#D
XX@@@@=E
Xh@@@@=#E
