简述氢气纯度检测装置的工作原理？

已知集合A={x|log₂（3-x）＜2}，集合B={x||x-3|＞2}，求A∩B．

阅读理解。

     ＊Teachers Wanted

     Are you a teacher? Do you like kids? Can you help them with Chinese on weekends? Come to join us.

Call John at 378-5788 for more information (信息).

     ＊Ping-pong Club

     Do you like to play ping-pong? Do you want to play ping-pong well? Mr. Cai can teach you. You can

come here every Saturday afternoon.

     Tel: 368-5778

     Add: Room 212 in School's P.E. Building.

      ＊Learning Japanese

     Can you speak Japanese? Do you want to learn Japanese? Please join the Japanese Club now. Call Jane

at 345-1238.

      Time: 8:30 a.m.-l1:00 a.m. (from Monday to Friday)

     ＊Musicians Wanted

      Are you a music lover? Can you sing or dance? Can you play any instruments (乐器)? Welcome to

our Star Rock Band.

      Please call Tina at 898-3443 or send an e-mail to music@163.com.

1. Gina is a good teacher and she wants to find a job. Who may offer (提供) her a job?[ ]

A. Tina.

B. John.

C. Jane.

D. Mr. Cai.

2. If you are a music lover, you want to be a dancer, how can you contact (联系) them? [ ]

A. Go to Room 212 in School's P.E. Building.

B. Call Jane.

C. Send an e-mail to music@163.com.

D. Call 368-5778.

3. Now Vera can speak Japanese well and she teaches kids Japanese.

    She works from Monday to Friday.

    Can you guess where she works? [ ]

A. The Ping-pong Club.

B. The Star Rock Band.

C. The Teacher Club.

D. The Japanese Club.

欧洲西部地区自西向东气候表现为

A．气温年较差逐渐缩小

B．大陆性逐渐减弱

C．海洋性逐渐减弱

D．降水量逐渐增多

女，62岁，偶然发现右乳外上象限1cm×2cm×2cm肿块，质较硬，无压痛，与皮肤粘连，右腋下未及肿大淋巴结。最可能诊断（）。

A.乳腺囊性增生症

B.乳腺内 * * 状瘤

C.乳腺癌

D.乳腺纤维瘤

E.乳腺结核

影响期权价格的因素包括（）。

A．协定价格与市场价格

B．标的物价格的波动性

C．标的资产的收益

D．权利期间