长效的青霉素制剂是： A．青霉素 B．氨苄西林 C．羧苄西林 D．苯唑西林 E．苄星

某帧中继网络中采用了部分网状连接结构，如图12-17所示。

以下是帧中继交换机(图中间的路由器) 的配置片段，请按要求补充相应的命令，或给出命令的解释。

frame-relay switch

interface Serial 0

encapsulation frame relay (56)

frame-relay intf—type dce (57)

frame-relay route 201 interface Serial 1 101 (58)

frame-relay route 202 interface (59)

frame-relay route 203 interface Serial 3 103

Interface Serial 3

encapsulation frame relay

frame-relay intf-type dce

frame-relay route (60)

56（）

促进肾小管分泌H⁺的主要因素是

A．K⁺的分泌

B．Na⁺的分泌

C．NH₃的分泌

D．尿素的排泄

患者，男，35岁，1个月前因车祸导致右肱骨中段骨折，行固定后发现右手腕和手指不能抬起，上臂明显疼痛，右手拇指背侧和前臂桡侧麻木，查体：伸腕、伸指肌力Ⅱ级，前臂旋前位时屈肘肌力Ⅳ级，肱二头肌和上臂其他肌肉力量正常，前臂桡侧感觉减退。临床诊断：右肱骨中段骨折并右桡神经损伤。

做神经肌电图检查时不可能出现的结果是（）

A.指总伸肌CMAP波幅低

B.示指固有伸肌CMAP潜伏时延长

C.旋后肌见正尖纤颤电位

D.肱桡肌见正尖纤颤电位

E.指浅屈肌CMAP波幅降低

(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.

List three activities that might develop into addictions based on the text. (Please answer within 8 words)
①______
②______
③______

公路养护工相关法律、法规知识有哪些？