可摘局部义齿的连接体进入倒凹区会引起A．连接作用减弱 B．义齿翘动 C．义齿就位困难

小虫从某点A出发在一直线上来回爬行，假定向右爬行的路程记为正数，向左爬行的路程记为负数，爬行的各段路程依次为：（单位：厘米）+5，﹣3，+10，﹣8，﹣6，+12，﹣10．（1）小虫最后是否回到出发点A？

（2）小虫离开原点最远是多少厘米？

（3）在爬行过程中，如果每爬行1厘米奖励一粒芝麻，则小虫一共得到多少粒芝麻？

分子的基本特征是                        、                        、                                 ．

With the national college entrance examination approach, many students are so worried about the coming exam to fall asleep at night and even suffer from mentally illness．It's a fairly common phenomeon among us students．Here is some effective methods for you to adopt．First of all，you should spend a plenty of time prepare for the test．Secondly，it is no need to feel nervous when you have some bad emotions, I think take a deep breath is a helpful way to reduce your stress．Last but not least，you ought to believe yourselves and keep a good state of mind．Follow my tips，but you will overcome your exam anxiety.

什么是四端网络？其传输函数有哪几种？

李延寿修《南史》和《北史》皆以北方皇帝的年号纪年，为什么？（）

A.李延寿是北方人

B.李延寿认为北方 * * 更得民心

C.李延寿认为北方 * * 是正统，具有合法性

D.这完全是出于纪年准确方便的考虑