对创新的"构思独特原则"可以从以下几个方面考察()
A.创新构思的新颖性
B.创新构思的开创性
C.创新构思的特色性
D.创新构思的价值性
参考答案:A, B, C
A carbon dioxide fire extinguisher should be recharged().
A.at least annually
B.whenever it is below its required weight
C.only if the extinguisher has been used
D.before every safety inspection
土地所有权的形式有()
A.国家所有
B.集体所有
C.私有
D.无主土地