【单选题】以下关于接口的说法中,正确的是
A.
接口中全部方法都是抽象方法,方法可以是任意访问权限
B.
接口中属性都是使用public static final修饰,没有显示赋值将使用默认值
D.
接口表示一种约定,接口表示一种能力,接口体现了约定和实现相分离的原则
【单选题】My aunt doesn't have much money, _________ she always enjoys herself.
【单选题】—I' m going to Hainan with my aunt for my holiday after the exam. — _____ . [ ]
【单选题】某人投资了三种股票,这三种股票的方差-协方差矩阵如下表,矩阵第(i,j)位置上的元素为股票i与j的协方差,已知此人投资这三种股票的比例分别为0.3,0.3.O.4,则该股票投资组合的风险是( D )。 A B C A 100 120 130 B 120 144 156 C 130 156 16...
【单选题】对于满载时的大型尾机船,以下()是错误的。
【单选题】-I'm looking for a birthday gift for my aunt, but I don't have the slightest idea. -__________ 一Do you know what her hobbies are?
A.
She doesn't have a CD player.
B.
Actually, she doesn't like to study with music.
C.
She listens to music, collects butterflies, and is interested in photography. Maybe I'll get her a C
【简答题】I have quite a small family. I live with my sister and my parents. My sister's name is ____ and she is 15 years old. She's a student. My mom's name is 2____ and my dad's name is 3____. Mom's a teacher...