Dad _____ lunch at home. [ ]
A. isn't has
B. doesn't has
C. don't have
D. doesn't have
答案:D
55除以8商是多少,余数是多少?
下列不是FCS技术特点的是()
A.开放性
B.互可操作性
C.现场环境的适应性
D.系统结构的集中性