拆除工程施工过程中，当发生重大险情或生产安全事故时，应及时排除险情、组织抢救、不用保

期货公司的交易保证金不足，期货交易所履行了通知义务，而期货公司未及时追加保证金，期货公司要求保留持仓并经书面协商一致的，对保留持仓期间造成的损失，由期货公司承担；穿仓造成的损失，也由期货公司承担。（）

武术具有改善和增强体质，以及（）等作用

A.娱乐观赏

B.凌弱逞强

C.打家劫舍

D.提高艺术素养

For users, microkernel technology promises (90) , compact and sophisticated operating systems that are typically (91) across a range of hardware platforms. These operating systems will be customizable to let users run multiple operating system and application "personalities" on top of a single microkernel (92) .
Microkernel based systems can provide this flexibility because the core operating system functions are (93) from the large number of utilities, features and extensions that are layered on top of them. As a result, updating and maintaining operating system is easier, since developers don’t have to modify the (94) every time they must acid a new feature.

A．core

B．center

C．heart

D．utility

在PowerPoint演示文稿制作时，用“项目符号和编号”命令可以修改项目符号的（）。

A.大小、颜色和位置；

B.颜色、位置和取消项目符号；

C.大小、位置和取消项目符号；

D.大小、颜色和取消项目符号。