NetWare 368网络系统中，安装只使用常规内存的DOS 212 工作站，所使用

f（x）=2x+1，x∈{1，2，3，4}，值域为 ______．

"Not all of the dinosaurs were dangerous". This sentence means   ___ . [ ]

A. none of the dinosaurs were dangerous.  

B. all of the dinosaurs were not dangerous.

C. few of the dinosaurs were dangerous.  

D. no dinosaurs were dangerous

3岁患儿，1岁时出现青紫，渐加重，剧烈哭闹后有昏厥史。查体：生长发育落后，口唇发绀，胸骨左缘第3肋间闻及Ⅲ级收缩期杂音，心脏摄片示肺血减少，“靴形心”影。最可能的诊断为( )

A．房间隔缺损
B．室间隔缺损 C．法洛四联症
D．动脉导管未闭
E．肺动脉瓣狭窄

检紧发动机高压油管的工艺要求为（）。

A、由里向外、由上到下依次紧固，检紧高压油管时避免碰坏喷油器插件

B、由外向里、由上到下依次紧固，检紧高压油管时避免碰坏喷油器插件

C、由里向外、由下到上依次紧固，检紧高压油管时避免碰坏喷油器插件

D、由外向里、由下到上依次紧固，检紧高压油管时避免碰坏喷油器插件