【单选题】推土机的作业形式中,最常用的作业方法是()。
【单选题】If new manufacturers enter the computer industry, then (ceteris paribus):
A.
some established manufacturers must exit the industry.
B.
the equilibrium price of computers must rise.
C.
the supply curve shifts to the right.
D.
the supply curve shifts to the left.
【单选题】The term "ceteris paribus" means that:
A.
everything is variable.
B.
all variables except those specified are constant.
C.
no one knows which variables will change and which will remain constant.
D.
what is true for the individual is not necessarily true for the whole.
【判断题】推土机的主要形式有直铲、角铲、U形推土板和缓冲推土板,最常用的是直铲和U形推土板。
【简答题】结合遗传物质的相关实验 , 回答下列问题 . (1) 后来 , 赫尔希和蔡斯用 1 法 , 进一步证明 DNA 是噬菌体的遗传物质 . 实验包括 4 个步骤 : 1. 上清液和沉淀物的放射性检测 2. 分别用含 用 35 S 或 32 P 的培养基培养细菌 3. 标记的 噬菌体 与未标记的细菌混合培养 4. 充分搅拌后离心 5. 噬菌体与 标记的 大肠杆菌混合培养 该实验步骤的正确顺序是 2 ( ...
【单选题】计算机硬件系统由五大基本部件,分别是运算器、( )、控制器、输入设备和输出设备。
【单选题】Ceteris paribus is the Latin expression for
A.
the (false) statement that what is true of the parts is true of the whole or what is true of the whole is true of the parts.
B.
the error of reasoning that a first event causes a second event because the first event occurred before the second event.
C.
an expression that means “other things being equal.”
D.
a statement about the way the economic world ought to be.