如果采用衬垫或平面法兰连接，则应采用（）的紧固螺栓、螺钉或采用其他型式的夹紧装置以保

下列命题中，假命题是[ ]

A．两个锐角对应相等的两个直角三角形全等

B．斜边及一锐角对应相等的两个直角三角形全等

C．两条直角边对应相等的两个直角三角形全等

D．一条直角边和另一条直角边上的中线对应相等的两个直角三角形全等

完形填空（2）

阅读下面短文，掌握其大意，然后从11~20各题所给的A、B、C和D项中，选出最佳选项，并在答题卷上将该项涂黑。

Dance can be art, ritual, or recreation. It goes __11____________ the functional purposes of the movements used in work or athletics in order to express emotions, moods, or ideas; tell a story; __12____________ religious, political, economic, or social needs; or simply be an __13___________ that is pleasurable, exciting, or aesthetically (审美的) valuable.

Besides giving __14____________ pleasure, dancing can have psychological effects. Feelings and ideas can be expressed and communicated; __15____________ rhythms and movements can make a group feel unitied. In some societies, dancing often __16____________ trance(心醉神迷的状态)or other changed states of consciousness. These states can be __17____________ as signaling possession by spirits, or they may be sought as a means to emotional __18____________. A state of trance may enable people to perform remarkable feats of strength, endurance, or __19____________, such as dancing through hot coals. In some societies shamans (道士) dance in trance in order to heal others physically or emotionally. The modern field of dance __20 ___________ developed as a means to help people express themselves and relate to others.

11.   A. behind                     B. after                        C. beyond                     D. forward

12.   A. do                           B. have                        C. perform                   D. serve

13.   A. experience         B. emotion                   C. feeling                     D. experiment

14.   A. mental                     B. physical                   C. emotional                 D. spiritual

15.   A. hearing                    B. practicing                 C. sharing                     D. enjoying

16.   A. refers to                   B. leads to                    C. turns up                   D. makes up

17.   A. interpreted        B. interrupted        C. preferred                  D. stressed

18.   A. pressure                   B. strain                       C. recognition        D. release

19.   A. danger                     B. pleasure                   C. delight                     D. sadness

20.   A. medicine                  B. operation                  C. therapy                    D. cure

若关系模式R＜A，B，C，A→B，B→C）＞，则将R分解为R₁（A，B）和R₂（B，C），则该分解（）。

A．满足无损连接，但不保持函数依赖

B．不满足无损连接，但保持函数依赖

C．既不满足无损连接，又不保持函数依赖

D．既满足无损连接，又保持函数依赖

慢性肺心病出现右心衰竭时，以下哪项可能不是心衰的表现（）

A.双肺底湿啰音

B.肝肿大和压痛

C.双下肢水肿

D.胸腔积液

E.肝颈静脉回流征阳性

诊断高血压病Ⅱ期主要依据是：（）

A.血压波动，无心脑肾损害

B.血压偏高伴有心脑肾损害

C.血压升高伴有左心室肥厚扩大

D.血压偏高伴有眼底出血渗血

E.血压升高伴有肾功能不全