China lies ____ the east of Asia and ____ the north of

Australia.

A．to; to

B．in; to

C．to; in

D．in; on

气瓶阀提供对气源的开启和关闭作用，设有过压保护膜片，当气瓶内的压力超过额定工作压力的（）左右时会自动卸压。

A.15%

B.16%

C.17%

D.18%