A.
公称压力PN<1.6MPa< /div>
B.
公称压力PN<2.5—6.4Mpa< /div>
【单选题】A ship can request completion of a when the ship is operating t a higher security level than the port facility or another ship it is interfacing with----
【简答题】按流体压力分类,阀门可分为真空阀、低压门、()和()。
【单选题】The permanent dunnage attached to the frames of the ship that aids in ventilation is(are)the ______.