A. Obtaining the literacy of mathematical research objects through abstract quantitative relations and spatial forms.
B. acquire mathematical literacy through abstract mathematical modeling and spatial forms.
C. acquire mathematical literacy through abstract mathematical calculation and spatial form.
D. acquire mathematical literacy through abstract logical reasoning and spatial forms.
Correct answer: a
Scheme 1:
Ab =103m.
¡Ï¡ÏA = 90¡ã£¬¡ÏACB = 60¡ã£¬
¡à¡ÏB=30 degrees, AC= 10m,
¡àBC=20£¬
¡àAB= 10 3 m company
Option 2:
According to t