公共物品的基本特征是()。
A、竞争性
B、非竞争性
C、排他性
D、非排他性
E、竞争性与非竞争性
参考答案:B, D
"When were you born?" "I was born on _______."[ ]
A. June 1st, 1997
B. 1997, June 1st
C. June, 1997 1st
D. 1st, 1997 June
有关女职工的劳动负荷,正确的是()
A.单人不得超过20kg
B.单人不得超过25kg
C.两人抬运不得超过30kg
D.两人抬运不得超过40kg
E.两人抬运不得超过45kg