1. [单选题]When replacing a thermostatic expansion valve sensing bulb, it is necessary to
A. apply a light film of oil to increase heat transfer
B. apply a light film of oil to prevent oxidation
C. apply a heavy coating of grease to function as a heat sink
D. carefully coat the device with silicone sealant to reduce the effects of convective cooling
2. [单选题]船上较常见的汽轮机泵是( )。
A. 主海水泵
B. 压载泵
C. 货油泵
D. 应急消防泵
