“只想享受权利而不愿履行义务，想多享受权利而不愿履行义务，想多享受权利而又少履行

一物体沿着凸透镜的主光轴移动，当物体离凸透镜10cm时，能在凸透镜另一侧的光屏上得到一个放大的像，当物体离凸透镜5cm时，它的像一定是[ ]

A．倒立缩小的实像

B．倒立放大的实像

C．正立放大的虚像

D．倒立放大的实像

如图所示为某家庭电热水器的原理示意图，发热体分别由R₁和R₂组成，通过通、断开关可以使热水器处于“加热”或“保温”状态．电热水器处于“加热”状态时，电路中消耗的功率大；电热水器处于“保温”状态时，电路中消耗的功率小．则：

（1）当开关S₁闭合、S₂断开时，电热水器处于______状态；

（2）当开关S₁、S₂均闭合时，电热水器处于______状态．

十二指肠溃疡并发症有（）

A.出血

B.穿孔

C.梗阻

D.瘘管形成

E.以上都可以

电视栏目可以分为哪几种类型？

The kernel is the (66) of an operating system such as Windows98, Windows NT, Mac OS or Unix. The kernel provides basic services for the other parts of the operating system, (67) it possible for it to run several programs at once (multitasking), read and write files and connect to networks and peripherals. Applications and utility programs use the services provided by the kernel to provide practical business functionality.

In operating systems such as Windows or most versions of Unix, the kernel (68) everything except application and utility programs.

In microkernel operating systems such as Digital Unix and Apples forthcoming Mac OS Server, the kernel (69) supports only multitasking and memory management. Other services such as applications, utilities and the user interface support device drivers, API and graphics which all (70) outside the microkernel.

（70）处填（）。

A．live

B．dwell

C．occupy

D．reside