设备检修的涵义是什么？包括哪些内容？

下列实验操作中错误的是（　　）

A．实验室制取气体，要先对装置的气密性进行检查

B．可燃性气体点燃前必须检验其纯度

C．给玻璃器皿加热时都需垫上石棉网

D．实验产生的废液就倒入指定的容器内

社会主义生产关系的基础是（）

A.国家资本主义所有制

B.个体所有制

C.生产资料公有制

D.集体所有制

超声引导下进行肾脏穿刺活检，最易产生的并发症是（）

A.尿路感染

B.肾内血肿

C.血尿

D.肾包膜下血肿

E.肾包膜外血肿

根据埃里克森的人格发展阶段，6～11岁的儿童要解决的主要矛盾是（）。

A.勤奋感对自卑感

B.自我同一性对角色混乱

C.主动感对内疚感

D.基本的信任感对基本的不信任感。

The following questions present a sentence, part of which or all of which is underlined. Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.

These questions test correctness and effectiveness of expression. In choosing your answer, follow the requirements of standard written English; that is, pay attention to grammar, choice of words, and sentence construction. Choose the answer that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy, or grammatical error.

Increasingly over the last few years, corporations involved in patent litigation have opted to settle the lawsuit rather than facing the protracted legal expenses of a court battle.（）

A. have opted to settle the lawsuit rather than facing

B. have opted settling the lawsuit instead of facing

C. have opted to settle the lawsuit rather than face

D. had opted for settlement of the lawsuit instead of facing

E. had opted to settle the lawsuit rather than face