汽油机上广泛采用的燃烧室为:()
A、涡流室燃烧室
B、浴盆型燃烧室
C、楔形燃烧室
D、蓬型燃烧室
参考答案:B, C, D
He had been practicing his spoken English with the ____ of working as a volunteer for World Expo Shanghai and his dream finally came true.
A.effort
B.exception
C.intention
D.contribution
依照《危险化学品安全管理条例》的有关规定,由( )负责危险化学品的公共安全管理。
A.质控部门
B.环保部门
C.经济贸易部门
D.公安部门