三个刚片两两之间由两个链杆相连接构成的体系是( )。A．无多余约束的几何不变体系

下肢深静脉血栓形成后再通（）

A.大隐静脉高位结扎剥脱术

B.股静脉瓣膜环形缩窄术

C.带瓣膜静脉段移植术

D.交通静脉结扎术

E.股浅静脉腔内瓣膜成形术

患者男，40岁。5年前开始经常心悸发作，最近发作频繁，持续时间较前延长，药物治疗效果不佳。心电图显示心律齐，QRS波形增宽，起始部有δ波。

最确切的治疗为（）

A.置入心脏永久起搏器

B.置入埋藏式心脏复律除颤器

C.切断His束

D.切断旁路传导

E.切除心室内膜

如图5-18所示，变截面轴向拉伸杆的变形能U为（）。

A．A

B．B

C．C

D．D

Part 4

Questions 26-45

·Read the following passage and decide which answer best fits each space.
·Forquestions26-45, markoneletterA, B, C or D on the Answer Sheet.
Both (26) and zoology are parts of a more general field of science, biology. The two are studies of (27) things, which share certain characteristics, (28) they are plants or animals. Botany deals with plants, whose organisms that can (29) their own food by the use of sunlight. Zoology on (30) hand, deals with animals, those organisms that cannot manufacture their own food and are thus dependent (31) plants for their food.
(32) plants and animals share many abilities, the extent (33) which plants can exercise some of those abilities is (34) . For example, both plants and animals need food, water, and warmth for growth, (35) plants can move to (36) those needs only by the slow extraction of their leaves and roots, while animals can move relatively (37) distances in relatively little time. When an animal is hurt with needle, the animal will (38) the part of the body (39) . This ability to draw back (40) pain or irritation, called irritability, is found only to a very limited extent in plants.
If plants (41) the same (42) as animals, animals would have had a more difficult time finding food. If animals were as limited as plants, they might (43) a means of manufacturing their own food, as plants do now. The world would be a very different place (44) it is if the characteristics of plants and animals were (45)

A．other

B．the other

C．another

D．each other

电感式传感器不能测量的量是（）。

A.压力

B.速度

C.位移

D.温度