私人物品的特征如下()。
A.既无竞争性又无排他性
B.既有竞争性又有排他性
C.有竞争性、无排他性
D.有排他性、无竞争性
参考答案：B
鳃裂囊肿常位于胸锁乳突肌的（）
A.上1／3前缘
B.上1／3后缘
C.中1／3前缘
D.中1／3后缘
E.下1／3前缘
Under the Vessel Bridge-to-Bridge Radiotelephone Act，failure of a vessel’s radiotelephone equipment（）.
A.constitutes a violation of the Act
B.obligates the operator to moor or anchor the vessel immediately
C.requires immediate，emergency repairs
D.does not，in itself，constitute a violation of the Act
