问题
单项选择题
浅埋暗挖法修建隧道的施工方法中，对围岩的扰动次数最少的是（）。
A.全断面法
B.正台阶环形开挖法
C.中隔壁法
D.CRD法
答案
参考答案：A
解析：
全断面开挖法采用一次开挖成型，该方法是对围岩的扰动次数最少，但对地质条件要求严格，围岩必须有足够的自稳能力。
考点:喷锚暗挖（矿山）法施工
搜题请搜索小程序“爱下问搜题”
浅埋暗挖法修建隧道的施工方法中，对围岩的扰动次数最少的是（）。
A.全断面法
B.正台阶环形开挖法
C.中隔壁法
D.CRD法
参考答案：A
解析：
全断面开挖法采用一次开挖成型，该方法是对围岩的扰动次数最少，但对地质条件要求严格，围岩必须有足够的自稳能力。
考点:喷锚暗挖（矿山）法施工
| The conception of God and nature and of the relation of man to both provided the 18th- century philosophers with their faith in the worth and dignity of the individual man and the efficacy of human reason. The 18th century was the moment in history when men experienced the first flush and freshness of the idea that man is master of his own fate; the moment in history, also, when this emancipating idea, not yet brought to the harsh test of experience, could be accepted with unclouded optimism. Never had the nature seemed less mysterious, more simply constructed, more open and visible and eager to yield its secrets to common-sense questions. Never had the nature of man seemed less perverse, or the intelligence and will of men more pliable (yielding) to rational persuasion. Never had social and political evils seemed so wholly the result of ignorance and superstition, or so easily corrected by the spread of knowledge and the construction of social institutions on a rational plan. The first task of political science was to discover the natural rights of man, the second to devise the form of government best suited to secure them. And for accomplishing this high task, for creating and maintaining a society founded on justice and equality, the essential freedom was freedom of the mind. |
The tone of this passage is ______ ．
A．neutral and scholarly
B．eloquent and articulate
C．upbeat and enthusiastic
D．balanced and optimistic