患者，女，24岁。停经6周诊断为早孕。行人工流产术，吸宫术后探宫腔发现探不到宫底，出血不多，自述心悸伴轻度腹痛及恶心。此时该患者首选的处理方法是（）。

A.吸氧，给予升压药

B.继续手术，清空子宫

C.暂停手术，密切观察病情

D.静脉注射阿托品

E.立即行剖腹探查术

Applications put computers to practical business (67) , but below the (68) it’s the heart of an operating system-the kernel-that provides the technical wizardry to juggle multiple program, connect to networks and store (69) .
A traditional kernel provides all the functions for applications. The kernel (70) memory, I/0 devices and parcels out processor time.
The kernel also supports security and fault (71) , which is the ability to recover automatically when parts of the system fail.

A．error

B．question

C．tolerance

D．problem