如图25-1a所示边长为a的立方晶胞中，ABCD晶面及AC晶向是晶体的一个滑移系。写

阅读理解。

     Please look at the Flight Timetable and choose the right answers.

     (departure=leaving)

1. You'll go to Australia. You can only take _____ when you reach Beijing Airport at eleven forty.

A .CA923

B. CA149

C. CA147

D. CA167

2. If you spend fourteen hours and ten minutes going to France, you must stay in _____ on the way.

A. Hong Kong

B. Shanghai

C. Moscow

D. Chengdu

3. It will take you to reach England if you stop in Hong Kong.

A. nine hours and twenty

B. ten hours and thirty-five

C. twelve hours and fifty

D. ten hours and forty-five

4. You may _____ in Beijing if you want to go to America.

A. take one plane

B. take two planes

C. take three plane

D. not take any planes

5. How many planes may you take in Beijing if you want to go to Australia?

A. One

B. Two

C. Three

D. Four

大多数血清IgA缺乏的个体（）。

A.分泌性IgA也同样缺乏

B.伴有自身免疫病

C.分泌成分部分或完全缺失

D.具有明显的上呼吸道感染倾向

E.伴有较低程度的各种主要Ig的缺损

下列图片反映了中国礼仪方式的变化，对其认识正确的是

A．跪拜礼是中国封建社会常用礼仪，能体现传统文化

B．到近代跪拜礼仪完全被握手脱帽等新式礼仪所取代

C．从跪拜到握手反映了人们思想观念变化和社会进步

D．辛亥革命后握手礼仪开始从西方传入中国上流社会

为了保证吊机的安全，卷筒机滑轮在哪些情况下应予报废？

近尾州水清测报系统采用了GSM短信技术。（）