中国从外国购买专利技术既是国际贸易行为也是国际科技合作行为。
参考答案:对
Our country will try to make greater progress in improving people's living conditions,________lowincome families.
A.especially
B.absolutely
C.totally
D.extremely
登革热的潜伏期为()
A.3~15天
B.15~30天
C.1~2天
D.15~45天
E.2~7天