[填空题]
The coefficient of static friction between hj0n th yvlp5o* gtb.,0ard rubber and norma8hfl / jsf;ua 0tm7b62eh)xhll street pavement is abos8xlf0/ ;ftuab) m2e h6hh7j lut 0.8. On how steep a hill (maximum angle) can you leave a car parked? $^{/circ}$
