电力系统中为什么会产生内部过电压？

患者男性，33岁，残冠，根尖病变。拔除过程中，远中颊根折断，取根时，牙根突然消失。捏鼻鼓气时拔牙窝内有气体溢出

此时进行X线检查首选的投照方法是（）

A．头颅正位片

B．通的上颌侧位断层片

C．头颅侧位片

D．全口曲面断层

E．上颌体腔片

急性化脓性鼻窦炎主要表现不包括（）。

A.头痛

B.胲嗽

C.鼻阻塞

D.脓涕多

E.局部疼痛

在最外层电子排布为：①3s²3p⁵ ②2s²2p² ③3s²3p⁴ ④3s²3p³的几种元素中，其最高氧化物对应水化物的酸性由强到弱的顺序是(    )

A．②③④①

B．①③④②

C．②④③①

D．①②③④

解码矩阵电路的任务是什么？

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.

This passage is primarily interested in which of the following ？（）

A. Investigating the factors that brought about the Marvel revolution and the Silver Age of comic books

B. Reviewing the factors that brought about the end of the Golden Age of comic books

C. Comparing and contrasting two eras in the history of comic books

D. Condemning the horror comic book for its corrupting influence on the nation’s youth

E. Evaluating the historical legacy of William Gaines’s EC Comics