1. 下列何者為線性系統？
(A) \(\dot{y}(t) = u(t)y(t)\)
(B) \(\dot{y}(t) = u(t) + y(t)\)
(C) \(\dot{y}(t) = u(t) + 1\)
(D) \(\dot{y}(t) = |u(t)|\)

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