以下对金融期权的表述中，正确的是()。A.金融期权实际上是一种契约 B.期权合约的买

保时捷和奔驰都位于德国的（）。

A、慕尼黑

B、斯图加特

C、柏林

观察植物细胞时，可以使用多种材料，制作成临时装片进行观察。制作洋葱表皮细胞临时装片就是其中之一。请回答：

1．观察临时装片时，不能将显微镜向后倾斜的原因是  [ ]

A．稳定性不够，显微镜易倾倒      

B．不利于操作  

C．装片上液体易溢出影响观察  

D．不容易对光

2．下面几种器具中，制作番茄果肉细胞临时装片中不需要的是[ ]

A．刀片    

B．镊子    

C．解剖针  

D．吸水纸

我国常规化学、临床血液学室间质量评价活动的可接受成绩为（）

A.≥90％

B.≤90％

C.≥80％

D.≤80％

E.≥75％

摩擦起电实际上不是______电荷，而是电子在物体之间的______．

The heat generated by the operating system war between rivals IBM Corp. and Microsoft Corp. is (21) .
Windows 95 and OS/2 introduce a new (22) . Both systems claim to multitask legacy DOS and 16-bit Windows applications. However, only OS/2 can provide full memory (crash) protection for these legacy applications because it is capable of running each DOS and Windows application within its full-protected memory address space.
Windows 95 will run all current Windows applications in the same shared- memory address space, affording full memory protection only to the (23) 32-bit Windows 95 applications. In other word, Windows 95 users will have to (24) their current Windows applications to Windows 95 version to match the memory protection OS/2 now delivers.
While OS/2 does afford superior memory protection and multitasking for legacy DOS and Windows applications, it will not be able to run any Windows 95 applications. IBM may address this (25) in an update of the OS but has no present plans to do so.

A．place

B．environment

C．condition

D．action