They look like slats to me, but I could be wrong. I'm asking because I know the 737, a very similar airplane, has inboard krueger flaps.
Also, what number of slats/krueger flaps does it have?
Aviation Stack Exchange is a question and answer site for aircraft pilots, mechanics, and enthusiasts. It only takes a minute to sign up.
Sign up to join this communityAll are slats. Here is one taking off. and a better view of one in the air. It looks like there are as many as four sections but they all extend and retract together.