目前世界上能独立掌握载人航天技术的国家有三个()
A、中、日、美
B、中、美、英
C、中、俄、美
D、中、德、俄
参考答案:C
胃毕Ⅱ式术后输入段梗阻()
A.呕吐物为食物,无胆汁
B.呕吐物为胆汁,无食物
C.呕吐物既有胆汁,又有食物
D.呕吐物呈酸臭味,有宿食
E.无呕吐
In enterprises, the gateway is the computer that (67) the traffic from a workstation to the outside network that is serving the Web pages. In homes, the gateway is the (68) that connects the user to the internet.
A.finds
B.searches
C.routes
D.tracks