阿摩線上測驗
21. In an open circulatory system, blood is _____.
(A) always inside of vessels and is under higher pressure than in closed circulatory systems
(B) not always confined to blood vessels and is under higher pressure than in closed circulatory systems
(C) always inside of vessels and is under lower pressure than in closed circulatory systems
(D) not always confined to blood vessels and is under lower pressure than in closed circulatory systems
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統計： A(0), B(0), C(0), D(1), E(0) #3385330
統計： A(0), B(0), C(0), D(1), E(0) #3385330
