问题 问答题 简答题

按误差出现的规律,测量误差分哪三类,各有何特点?

答案

参考答案:

按误差出现的规律,测量误差可以分为三类:

①系统误差,系统误差是有规律的测量误差,如量具的示值误差、回程误差、基准件误差、原理误差、温度误差和测量力误差;

②随机误差,随机性误差是以不可预知方式微小变化的误差,是测量过程中许多独立、微小的随机因素引起的综合结果,随机误差通常按正态分布;

③粗大误差。粗大误差的值较大,它是由测量过程中各种错误所致,应予以剔除。

阅读理解
单项选择题

The questions in this group are based on the content of a passage. After reading the passage, choose the best answer to each question. Answer all questions following the passage on the basis of what is stated or implied in the passage.

While most people agree that the Golden Age of comic books began with the introduction of Superman in 1938 in Action Comics #1, there is less agreement about when exactly the Golden Age ended. There is a general consensus, however, about the factors that brought the Golden Age to a close: the rise of the horror comic book in the late 1940s, and the resulting backlash against comic books in the early 1950s.

Superhero comic books reached their peak of popularity in the early 1940s because of all the GIs in Europe and Japan who eagerly read about Superman, Batman, and The Spirit. When these soldiers came home, they still wanted to read comic books, but they sought out more adult content. William Gaines of EC Comics was happy to meet the market demand with such grim and gritty titles as Weird Fantasy and The Crypt of Terror. The creators of superhero comic books, not wanting to be left behind, responded by matching their protagonists against darker criminals in more violent encounters.

These darker comic books aroused the anger of child psychologist Fredric Wertham, who believed that comic books were leading the nation’s youth into crime, violence, and drug abuse. Wertham’s book, The Seduction of the Innocent, was a national best-seller that helped bring about congressional investigations into the corrupting influence of comic books. The Senate committee that reviewed Wertham’s charges decided to create the Comics Code Authority, a regulatory body that prohibited comic books from mentioning sexuality, alcohol, drugs, criminal behavior, or any themes related to the horror genre.

These regulations had a numbing effect on the industry. EC Comics was nearly driven out of the comics business, and the other major players canceled many of their most prominent titles. The comics business did not recover until the Marvel revolution of the early 1960s ushered in the Silver Age.

According to the passage, which of the following was true of the creators of superhero comic books in the postwar years ?()

A. They sought to head off the censorship of the Comics Code Authority by voluntarily prohibiting stories dealing with sexuality, drugs, or criminal behavior.

B. They introduced characters such as Superman and The Spirit.

C. They unintentionally laid the groundwork for the transition from the Golden Age of comic books to the Silver Age.

D. They focused increasingly on flashy artwork and less on well-developed stories.

E. They responded to the competitive pressure from horror comic books by increasing the amount of violence in their stories.