依据惯性原则进行技术预测的前提条件之一是:()
A.系统结构的稳定性;
B.技术发展的规律性;
C.技术与技术之间的矛盾性;
D.技术发展的不确定性。
参考答案:A
___ massive 9.0 magnitude quake hit northeast Japan on March 11,2011, causing many injures, fires
and ___ ten-meter tsunami along parts of the country's coastline. [ ]
A.The; a
B. A; a
C. A; the
D. The; the
CR系统应当包括
A.X线发射系统
B.成像板(I
C.IP读取子系统
D.投影仪
E.打印机