眶上壁由下列哪几块骨构成 A．颧骨 B．筛骨 C．额骨 D．蝶骨 E．上颌骨

阅读理解。

     Bob and Frank are good friends. They often go to movies together (一起) on weekends. Bob's favorite

actor is Cheng Long. He has an action movie, Who Am I. It's very exciting. Frank likes the actor Rick Smith.

He really likes his movie, Black September. Frank thinks it's a very successful thriller. Bob and Frank are

American, but they both like Beijing Opera, they think they can learn about Chinese history from these

movies.

1. Bob and Frank often _______ together on weekends.

A. go to school

B. go to a movie

C. are good friends

D. go to see an action movie

2. Bob's favorite actor is _______.

A. Frank

B. Cheng Long

C. Beijing

D. American

3. The film (影片) Black September is _______.

A. an action movie

B. a comedy

C. Beijing Opera

D. a thriller

4. Bob and Frank come from _______.

A. America

B. China

C. Japan

D. England

5. Which of following is false ( 下列哪种说法是错误的)?

A. Bob and Frank are good friends.

B. Who Am I is an action movie.

C. We can learn about Chinese history from action movies.

D. Bob and Frank like Beijing Opera.

下表是元素周期表的一部分，表中所列的字母分别代表某一种化学元素。

(1)上述第三周期元素中第一电离能(I₁)最大的是________(用字母表示，下同)，c和f的I₁大小关系是________大于________。

(2)上述元素中，原子中未成对电子数最多的是________，写出该元素的电子排布式：________________。

(3)根据下表所提供的电离能数据，回答下列问题。

	锂	X	Y
I1	519	502	580
I2	7296	4570	1820
I3	11799	6920	2750
I4		9550	11600

①表中X可能为以上13种元素中的________元素。用元素符号表示X和j形成的化合物的化学式____          ____。

②Y是周期表中的________族的元素。

网络计划中，某项工作的进度偏差大于该工作的自由时差，小于总时差，则它将（）。

A.对后续工作及工期产生影响

B.对后续工作及工期均不产生影响

C.对后续工作产生影响，不影响工期

D.对后续工作不产生影响，影响工期

流体流动的阻力实验是测定（）和（）的关系及流体流经（）和（）的关系。

压掌压纱力是怎样产生的？压纱力在一落纱中怎样变化？有什么影响？