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【单选题】
Which of the following distinguishes a "straight-line" production possibilities curve from one that is "bowed out"?A.
A straight-line production possibilities curve exhibits increasing opportunity costs, whereas a bowed production possibilities curve does not.
B.
A straight-line production possibilities curve exhibits decreasing opportunity costs, whereas a bowed production possibilities curve does not.
C.
A straight-line production possibilities curve exhibits constant opportunity costs, whereas a bowed production possibilities curve does not.
D.
A straight-line production possibilities curve is upward sloping, whereas a bowed production possibilities curve is not.
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【单选题】下列关于恶意代码的描述中，错误的是
A.
木马能够通过网络完成自我复制木马是没有自我复制功能的恶意程序 B})电子图片中也可以携带恶意代码
B.
JavAscript... VBscript..等脚本语言可被用干编写网络病毒
C.
蠕虫是一个独立程序，它不需要把自身附加在宿主程序上
【单选题】Which of the following substance are not covered by MARPOL convention .
A.
Noxious liquid substance in bulk
B.
Harmful substance in package
C.
Sewage and garbage
D.
All dangerous goods
【单选题】Which of the following statements about function and substance is true?
A.
Function belongs to yin and substance to yang.
B.
Function belongs to yang and substance to yin.
C.
Both function and substance belong to yin.
D.
Both function and substance belong to yang.
【单选题】The half-life of a radioactive substance is:
A.
half the time it takes for the entire substance to decay
B.
the time for half the substance to decay
C.
the time for radium to change into lead
D.
calculated from
【简答题】把外源基因转化到 大肠杆菌的方法有:________ 和__________。
【判断题】如果类 Hello 中含有 string 类型的数据域成员 s，那么 s 的初始化赋值表达式s{"Hello"}可以放在 Hello 类的构造函数的函数体中
A.
正确
B.
错误
【简答题】A．A disease. B．A cause of fatal plague. C．A substance in a flea's legs. D．The substance that a flea lives on.
【简答题】Which substance in cigarette cause, cancer?
【简答题】实验一 熟悉Java运行环境(2) 实验要求: 编写4个源文件:MainClass.java、A.java、B.java和C.java,每个源文件只有一个类,MainClass.java是一个应用程序(含有main方法),使用了A、B和C类。将4个源文件保存到同一目录中,例如:C:\100,然后编译Hello.java。 实验效果: 你好,只需编译我 I am A I am B I am C fb...
【多选题】在海洋运输货物保险业务中,构成被保险货物实际全损的情况有()
A.
保险标的物完全灭失
B.
被保险人已不能恢复保险标的物所丧失的所有权
C.
保险标的物发生变质,失去原有使用价值
D.
船舶失踪达到一定时期
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