如果在陈某饲养过程中，马脱逃，但陈某已采取了足够的防护措施，陈某是否应对马的脱逃承担

安全系数的提高应通过( )来达到。

A．增加构件尺寸

B．增加构件重量

C．增加费用

D．优化结构设计

XT-12通井机变速箱螺旋伞齿轮的接触印痕长度不小于齿长的（）。

A、80%

B、70%

C、60%

D、50%

高压阀门连接法兰螺柱孔轴线相对于法兰定位圆的位移度不应超过螺柱与螺柱孔间隙的（）。

A.1/2

B.1/3

C.1/4

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.

Intrigued by the new rules that favored quickness over strength, the decision of the coach was to give more playing time to the team’s smaller athletes.（）

A. the decision of the coach was to give more playing time to the team’s smaller athletes

B. the coach decided to give the team’s smaller athletes more playing time

C. it was decided by the coach to give the team’s smaller athletes more playing time

D. the team’s smaller athletes were given more playing time by the coach

E. more playing time was given to the team’s smaller athletes by the coach

负硬度是指水中的（）。