采气树地面安全阀(SSV)的控制方式为()。
A.气液联动阀
B.气动双作用球阀
C.气动单作用球阀
D.液动平板闸阀
参考答案:D
Welcome to the House of Dumplings! We have special dumplings. [ ]
A. sell
B. buy
C. eat
D. like
船舶在强风或强流水域单锚泊时:().
A.易发生偏荡,易走锚
B.易发生偏荡,不易走锚
C.不易发生偏荡,易走锚
D.不易发生偏荡,不易走锚