阿摩線上測驗
16. Consider the sphere x2+y2+z2-2x=0 and plane 
+ y + z = 0 . Find the angle between normal lines of these two surfaces at point (0, 0, 0).
(A) 
(B) 
(C) 
(D) 
(E)
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統計： A(0), B(1), C(0), D(0), E(0) #2348351
統計： A(0), B(1), C(0), D(0), E(0) #2348351