不属于因人类造成的环境污染而诱发的自然灾害的是[ ] A．某些地区大骨节病和地方

增升装置的增升原理是什么？

下列器官中，适于在水中进行呼吸的是

A．肺

B．气囊

C．气管

D．鳃

有限责任公司与无限公司、两合公司、股份两合公司之间主要区别是其股东均负有有限责任。

Soon, more of the information we receive via the Internet could come (155) in digital wrappers.
Wrappers are made up, (156) software code that’s targeted to do specific things with the data (157) within them, such as helping to define queries for search engines. They also keep (158) from (159) access to that code.

A．gain

B．gained

C．gains

D．gaining

S700K电动转辙机采用交流（）交流控制.

A.220V

B.380V

C.160V

D.180V