超星 - 第2章测验 - 查题吧

判断题

Assume 1990 to be the base year. If by the end of 2004 a country's export price index rose from 100 to 130 while its import price index rose from 100 to115, its terms of trade would equal 113.

A. 对
B. 错

判断题

Assume 1990 to be the base year. If by the end of 2004 a country's export price index rose from 100 to 140 while its import price index rose from 100 to 160, its terms of trade would equal 120.

A. 对
B. 错

判断题

Assume 1990 to be the base year. If by the end of 2004 a country's export price index rose from 100 to 125 while its import price index rose from 100 to 125, its terms of trade would equal 100.

A. 对
B. 错

判断题

The commodity terms of trade are found by dividing a country's import price index by its export price index.

A. 对
B. 错

判断题

For the commodity terms of trade to improve, a country's export price index must rise relative to its import price index over a given time period.

A. 对
B. 错

判断题

For the commodity terms of trade to improve, a country's imiport price index must rise relative to its export price index over a given time period.

A. 对
B. 错

单选题

拉深“制耳”现象的产生是以下何种组织存在导致的？（）

A. 变形织构
B. 亚结构
C. 纤维组织

单选题

下列三种金属强化方式，哪种在提高金属的强度、硬度的同时，塑性也能提高？（）

A. 热处理强化
B. 细晶强化
C. 加工硬化（也称形变强化）

单选题

随着塑性变形程度的增大，金属强度和硬度显著，塑性和韧性明显；其物理化学性能也发生变化。这样的现象称为加工硬化。

A. 提高；下降
B. 下降；提高
C. 提高；提高
D. 下降；下降

单选题

以下关于多晶体塑性变形特点的描述中，哪一项是错误的？（）

A. 各晶粒变形不同步
B. 各晶粒变形独立、自由
C. 各晶粒变形不均匀

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