一桶油先用去20%后，再增加20%，油的总量与原来一样．______．

根据句意和首字母提示，补全下列单词。

1. Be q_______! Or we will be late for school.

2. Lily got a b________ on her birthday party. She wanted to ride it to school.

3. We studied in No.1 M________ School in 2007.

4. Now many Americans are interested in Chinese history and c________.

5. There is n_______ difficult in the world if you put your heart into it.

已知通过一导体环的磁通量在0.04s内由8×10^-3wb均匀地减小到2×10^-3wb。若环的平面法线与磁场方向一致，则环中产生的感应电动势为( )。

A．0.15V

B．0.20V

C．0.25V

D．0.28V

吐舌多见于（）。

A.疫毒攻心

B.动风先兆

C.小儿发育不全

D.痰浊内阻

E.亡阳伤津

纱线经过络筒后捻度会有增加。

( )木屋架制作的基本项目：木屋架的腹杆轴线与承压面垂直，连接紧密，扒钉牢固，且扒钉处无裂缝。