绿色和平组织的调查报告显示,用Linux系统的企业仅需()年更换一次硬件设备。
A.5~7
B.4~6
C.7~9
D.6~8
参考答案:D
I warned him of the slippery road, but he fell on fours ________ I finished my words.[ ]
A. as
B. before
C. until
D. since
关于处理昏厥的方法,不正确的是()。
A.服用冷水
B.注意保暖
C.掐人中穴
D.补充维生素C