双优化认定原则？

给下列句子排序。

( ) Happy birthday, Jenny!

( ) My mother and father, sister and brother will come.

( ) Will you come to my birthday party, too?

( ) Hi, Li Ming! Today is my birthday!

( ) I will have a birthday party tonight.

( ) Sure!

( ) I will have a birthday cake and candles, and birthday presents.

（6分）利用如右图所示的装置进行“验证机械能守恒定律”实验，除了所需的打点计时器（带导线）、纸带、复写纸、铁架台、纸带夹和重物，此外还需要下列器材中的_______（填字母代号）

A．直流电源

B．交流电源

C．游标卡尺

D．毫米刻度尺E．天平及砝码

F．秒表

He had his camera ready         he was in the hotel room.[ ]

A. in case

B. if only

C. so that

D. even though

王安石提出“行者，有生之本”。与之相对立的观点是

A．“心无外物”

B．“天地为万物之本”

C．“夫形于天地之间也，物也”

D．“舍天地则无以为道”

接受胃镜及活体组织检查者，术后应禁食

A．2小时

B．4小时

C．6小时

D．12小时

E．24小时