[填空题](45462)两线路中心距离在5m以下的曲线地段,内侧曲线的超高不得小于必须根据计算加宽两线的中心距离。(1.0分),否则,()

Trees should only be pruned when there is a good and clear reason for doing so. And fortunately, the number of such reasons is small. Pruning involves the cutting away of over grown and unwanted branches, and the inexperienced gardener can be encouraged by the thought that more damage results from doing it unnecessarily than from leaving the tree to grow in it sown way.
Firstly, pruning may be done to make sure that trees have desired shape or size. The object may be to get a tree of the right height, and at the same time to help the growth of small side branches, which will thicken its appearance or give it a special shape. Secondly, pruning may be done to make the tree healthier. You may cut out diseased or dead wood, or branches that are rubbing against each other and thus cause wounds. The health of a tree may be encouraged by removing branches that are blocking up the center and so preventing the free movement of air.
One result of pruning is that an open wou
A. To discuss different methods of pruning.
B. To introduce some common knowledge of pruning.
C. To explain how trees develop disease.
D. To give practical instruction for pruning a tree.

(56) "Humanism" has used to mean too many things to be a very satisfactory term. (57) Nevertheless, and in the lack of a better word, (58) I shall use it here to explain for the complex of attitudes which this discussion has undertaken to defend.
(59) In this sense a humanist is anyone who rejects the attempt to describe or account of man wholly on the basis of physics, chemistry, and animal behavior. (60) He is anyone who believes that will, reason, and purpose are real and significant: that value and .justice are aspects of a reality called good and evil and rests upon some foundation other than custom; (61) that consciousness is so far from a mere epiphenomenon that it is the most tremendous of actualities; (62) that the unmeasured may be significant; or, to sum it all up, (63) that those human realities which sometimes seem to exist only in human mind are the perceptions of the mind.
(64) He