电流互感器在运行中二次为什么不允许开路？

烷烃是石油的主要组分，在常温下，从甲烷到（）均是气态，是天然气和炼厂气的主要成分。

A.乙烷

B.丙烷

C.丁烷

D.戊烷

患者女，20岁，因“面部变圆、变红，向心性肥胖、宽大紫纹8年，加重8个月”来诊。查体：BP160/120mmHg。实验室检查：FBG＞140mg/dl，血钾2.5mmol/L，血ACTH99.6pg/ml；大、小剂量地塞米松抑制试验均不被抑制。胸部及肾上腺CT：未见异常。鞍区MRI：部分空泡蝶鞍，蝶窦内异常信号。

此时的处置方案是（）（提示：经口鼻蝶窦内病变切除，同时行垂体探查，发现蝶窦病变为蝶窦囊肿，垂体有微腺瘤，切除微腺瘤。术后血压、血糖恢复正常，需要糖皮质激素替代。2年多后临床和激素测定提示皮质醇增多症复发。）

A.进一步检查以明确诊断

B.没有必要做进一步检查

C.如做进一步检查，应以垂体MRI动态加强为首选

D.如做进一步检查，应以岩下静脉插管取血为首选

E.如不做进一步检查，选择再次垂体手术

F.如不做进一步检查，选择垂体放疗

已知120×120方坯长11.7m，将其轧制成φ8mm的线材，若忽略轧制过程中的损失，试计算线材的总长度为多少m？

绝对黑体

(1) The word "addiction" usually makes you think of alcohol or drugs, but in modern-day society we are seeing some new kinds of addictions. Some people are compulsive (难以自制的) shoppers. Others find it impossible to pull themselves away from their work. Still others spend countless hours watching TV or playing computer games.
(2) Over the years, shopping has become a very common activity. Many people enjoy going to stores more and more every day, but it’s more than a common hobby for some of them. They have turned into shopaholics. They are people who simple enjoy shopping and walking around spending money without being able to stop doing it. They are hooked on shopping and usually buy things that they don’t need. Even though they don’t have enough money, they buy everything they want.
(3) The question is, why do they have this addiction There isn’t a specific answer. Some people go shopping when they are sad, worried, upset or lonely, and they want to feel better. They use this activity as a way to forget their problems. Shopaholics say that they feel more important and better after they buy something. They also tend to have this addiction when they feel guilty.
(4) Shopaholism seems to be a harmless addiction, but it can ______. Some of them can be psychological. If this is the case, people addicted to shopping should go to a support group to help them break this habit. However, the process, like for most addictions, is long, and they suffer a lot. It can also cause financial problems. They just think about satisfying their feelings, so they spend money they don’t have. They get deep in debt, and they can even go bankrupt and get sent to prison.

What’s the main idea of Paragraph 3 ( Please answer within 8 words)