根据我国《宪法》,下列组织中,属于城市和农村按居民居住地区设立的基层群众性自治组织是()。
A.街道办事处
B.业主委员会
C.居民委员会
D.村民委员会
参考答案:C, D
对电动机从基本频率向下的变频调速属于()调速。
A、恒功率
B、恒转矩
C、恒磁通
D、恒转差率
翻译画线词组
(1)________He gave all his land away to the city.
(2)_________He is sure to give away your secrets.
(3)_______Have you given the money back toJane yet?
(4)___________The mother gave in and bought a toy for her child.
(5)_______These wild flowers gave off a nice smell.
(6)______The headmaster will give out diplomas.
(7)________This device gives out flashes of light in the fog.
(8)_______Our supply of wine has given out.
(9)_________I wish I could give up sweets.
(10)________Don't give up halfway.