AutoCAD中，输入点的坐标时不可以采用的坐标系类型是（）。A、笛卡尔坐标系 B、

投资本金20万，在年复利5.5%情况下，大约需要（）年可使本金达到40万元。

A.14.4

B.13.09

C.13.5

D.14.21

语法填空

     Some people live in the world for body while others for dignity.

     I once took a walk along the street 1.________a Saturday dusk, with a Pepsi can in my hand.An old woman in ragged clothes, 2.________was living on collecting used cans, jars and tins, moved slowly

towards me, with a bag on the back!3.________(walk) nearer, she looked up at me and then fixed her

eyes on my can.At that time, I hadn't finished my cola, so I gave 4.________several coins instead.

     She stared at me for a few seconds 5.________handed back the money.Quite confused, I asked:

"Why not? Isn't that 6.________you want?"

     "I am not a beggar, " she said 7.________(serious), word by word.

     Instantly, I felt so sorry.I had intended 8.________(help) her, completely misunderstanding her.Thus I hurt her.What I could do at that moment was only to drink up the cola and handed her 9.________

emptied can.This time, she gave me a smile with 10.________(satisfy) and gratitude in her eyes.The

woman is poor in material life but is so respectable as a man.I am not only moved but also have learned a

good lesson.

沙眼角膜血管翳位于角膜的哪一层下( )

A．上皮层
B．前弹性层
C．基质层
D．后弹性层
E．内皮层

微型计算机在开机自检时，遇到______不存在或有错误时，计算机仍会正常开机启动。

A．键盘

B．主板

C．鼠标

D．内存

我国发电机的额定周率都为（）周/秒。