既是对原有股东的一种优惠，又能征集部分股金实现公司增资计划的发行方式是 ( )A．

—How did you go home after the party last night?

—Well, there were no buses________we had to walk. [ ]

A. so as to  

B. in order to

C. so that  

D. in order that

前庭器官受到过强或过长的刺激，常会引起恶心、呕吐、眩晕等现象，严重时可致晕船、晕车和航空病。

半规管壶腹嵴的适宜刺激是（）。

A.旋转加速运动

B.旋转匀速运动

C.直线加速运动

D.直线匀速运动

E.直线减速运动

Which of the following pieces of equipment would do best job to help prevent external rotation of the client’s right leg postoperatively（）

A. Sandbags.

B. A high footboard.

C. A rubber air ring.

D. A metal bed cradle.

计算

，其中Ω是由锥面

与平面z=1所围成的闭区域．

简述过度农垦的沙漠化现代过程。