从脂肪酸分子上的羧基端碳原子算起，如果第一个不饱和键所在碳原子的序号是3，则为n—3

先写日志的原则是为了发生故障后保持数据库的什么性能所必须遵循的原则

A．原子性和持久性

B．一致性和持久性

C．原子性和一致性

D．原子性和隔离性

搭配。

A

( )1. What day is it today?

( )2.What time is it mow ?

( )3.Shall we go and see the monkey?

( )4.What are they doing ?

( )5.Would you like to come to supper?

( )6.How does Jim go to work?

( )7.Who is tall,Jim or you?

( )8.May I come with you ?

( )9.Where are the oranges?

( )10.Why don't you come with me ?

B

A.No ,let's go and see the pandas .

B.It's Sunday.

C.They are cooking some food .

D.That is a good idea .

E.They are on the table .

F.Jim is ,Ithink.

G.Sure! You're welcome.

H.It's five minutes past six .

I.I'd love to .But Imust ask my parents first.

J.By bike

路床.基层的弯沉检测是质量检验的非主要检测项目。（）

对国家规定的“三包”商品，保修期内（）次修理仍不能正常使用，经营者应负责更换或者退货

A.一次

B.二次

C.三次

D.四次

提速道岔可动心轨实际尖端至翼轨趾端的距离（简称尖趾距离）为2396mm，容许误差为0，+25mm。