下列哪些是老舍的短篇小说？A.《鼓书艺人》 B.《柳家大院》 C.《黑白李》 D.《

. Many experts agree that once these treasures are _______ to the air, great harm will be done to them. So they think it better not to unearth the treasures.

A．exposed

B．threatened

C．constructed

D．conserved

I can see two birds_____the tree and some red apples_____the tree.      [ ]

A. in; on    

B. on; in  

C. in; in  

D. on; on

创建一个名为student的新类，保存新类的类库名称是mylib，新类的父类是Person，正确的命令是( )。

A) CREATE CLASS mylib OF student As PerSon
B) CREATE CLASS studem OF Pemon As mylib
C) CREATE CLASS Student OF mylib As PerSon
D) CREATE CLASS Person OF mylib As student

( )是大型基坑开挖和大型采石场开采的主要方法。

A．浅孔爆破

B．深孔爆破

C．洞室爆破

D．光面爆破

机床空转试验的目的是什么