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Fill in the appropriate units in the horizontal line. The area of the school playground is about 600______ The area of a math book is about 5______ Xiao Gang weighs about 35 _ _.
(1) The school playground covers an area of about 600 square meters;

(2) The area of a math book is about 5 square decimeters;

(3) Xiaogang weighs about 35 kilograms;

(4) The area of a classroom is about 48 square meters;

(5) My stride is about 30 cm;

(6) The classroom door is 2m high and covers an area of 2m;

China's land area is about 9.6 million square kilometers.

So the answer is: square meter, square decimeter, kilogram, square meter, centimeter, meter, square meter, square kilometer.

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