增值税是对( )实现的增值额征收的一种税。A．销售货物或提供劳务过程中 B．特定的

A punctual person is in the habit of doing a thing at the proper time and is never late in keeping an appointment．The unpunctual man, on the other hand, never does what he has to do at the right time． 小题1:

There's a proverb which says，“Time flies never to be recalled．” This is true．小题2:The unpunctual man is forever wasting his most valuable possessions as well as others'．The unpunctual person is always complaining that he finds no time to answer letters, or return calls or keep appointments．小题3: He knows that he can get through his huge amount of work only if he faithfully keeps every appointment and deals with every piece of work when it has to be attended to．

小题4: ．If a person is invited to dinner and arrives later than the appointed time, he keeps all the other guests waiting for him．Usually this will be regarded as rude both to the host and the other guests．

Unpunctuality, moreover，is very harmful when it comes to one's duty．Imagine how it would be if those who are put in charge of important tasks failed to be at their proper place at the appointed time．小题5:

A．They appear to be busy but never get well paid．

B．He is always in a hurry and ends up losing time．

C．Maybe nobody minds being kept waiting at a dinner party．

D．A lost thing may be found again, but lost time can never be regained．E．But the man who really has a great deal to do is very careful of his time．

F．A man who is known to be habitually unpunctual is never trusted by others．

G．Failure to be punctual in keeping one's appointment is a sign of disrespect towards others．

由3个节点可以构造出多少种不同的二叉树

A．2

B．3

C．4

D．5

曲线地段，未被平衡过超高，困难情况下不得大于( )。

A.50mm

B.60mm

C.75mm

D.90mm

( )代表了古希腊数学的最高成就。

A．《新工具》

B．《自然哲学的数学原理》

C．《方法论》

D．《几何原本》

在移动用火位置或隔天用火时，监护人和用火作业人应重新落实（）。