【单选题】The required portable radio apparatus on an international voyage must be stowed in___.
C.
the radio room, bridge, or protected location
D.
an unlocked cabinet next to the station bill
【单选题】当注塑模采用推板脱模机构时,为防止推板刮伤凸模,推板内孔应比凸模成型部分大( )mm。
【简答题】最大能填几? 30×______<250;60×______<430;42×______<213;24×______<252.
【判断题】主轴交流电机的变频调速一般在低速时为恒转矩恒功率调速;高速时为变功率变转矩调速。
【简答题】If a certification is required on the commercial invoice (1) where a signed invoice is required by the credit, the certification ( ) must/( ) (need not) be separately signed. (2) where a signed invo...
【判断题】对于柴油机,可根据环境温度选择机油的使用级。
【单选题】JPP泵的启动顺序是( )
A.
1JPP001PO—1JPP002PO—2JPP001PO/2JPP002PO
B.
1JPP001PO—2JPP001PO—1JPP002PO--2JPP002PO
C.
1JPP001PO—1JPP002PO—2JPP002PO/2JPP001PO
D.
1JPP001PO—2JPP001PO—1JPP002PO/2JPP002PO