普鲁卡因不可用于哪一种局麻（）。 A.硬膜外麻醉 B.表面麻醉 C.蛛网膜下腔麻醉

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

There is an English saying:“____1____.” Until recently, few people took the saying seriously. Now, however, doctors have begun to look into laughter and the effects it has on the human body. ___2_____.

Tests were carried out to study the effects of laughter on the body. People watched funny films while doctors checked their hearts, blood pressure, breathing and muscles. It was found that laughter has similar effects to physical exercise. ___3_____. If laughter exercises the body, it must be beneficial.

Other tests have shown that laughter appears to be able to reduce the effect of pain on the body. In one experiment doctors produced pain in groups of students who listened to different radio programs. The group that tolerated(忍耐) the pain for the longest time was the group which listened to a funny program. ___4_____

____5____. They have found that even if their patients do not really feel like laughing, making them smile is enough to produce beneficial effects similar to those caused by laughter.

A．Laughter can prolong one’s life.

B．As a result of these discoveries, some doctors in the United States now hold laughter clinics in which they help to improve their patients’ condition by encouraging them to laugh.

C．The reason why laughter can reduce pain seems to be that it helps to produce a kind of chemicals in the brain which diminish both stress and pain.

D．It increases blood pressure, the heart beating and breathing; it also works several groups of muscles in the face, the stomach and even the feet.E. Although laughter helps cure the disease, doctors still can not put this theory into clinic practice.

F. Laughter is the best medicine.

G. They have found that laughter really can improve people’s health.

在电阻与电感串联的交流电路中，总电压是各分电压的相量和，而不是代数和。

混全色包括（）。

A.间色和复色

B.补色和复色

C.间色和余色

D.补色和余色

某女，35岁。做饭时不慎将手指切伤，未能及时到医院治疗，伤口感染，不幸患上破伤风。现表现为全身肌肉痉挛，抽搐，牙关紧闭，角弓反张，高热，大汗淋漓，面色青紫，呼吸急促，痰涎壅盛；大便秘结，小便短赤；舌红苔黄，脉弦数。应诊断为哪一期，用何方治疗（）

A．发作期，玉真散

B．发作期，木萸散

C．前驱期，玉真散合五虎追风散加减

D．前驱期，大定风珠

E．发作期，安宫牛黄丸

五类线的制作，应符合国际规定的接口标准。568A排序顺序为（）。

A、蓝--1，蓝白--2，橙白--3，绿白--4，绿--5，橙--6，棕白--7，棕—8

B、绿白--1，绿--2，橙--3，蓝--4，蓝白--5，橙白--6，棕白--7，棕—8

C、绿白--1，绿--2，橙白--3，棕--4，棕白--5，橙--6，蓝白--7，蓝—8

D、绿白--1，绿--2，橙白--3，蓝--4，蓝白--5，橙--6，棕白--7，棕—8