After resolving the trouble of main power supply, main switch of emergency generator should（）, if power supply is refreshed. ["be switched off by the duty officer","be switched on by the duty officer","be switched off automatically","be switched on automatically"]
（）不属于“汇通华夏”产品所具有的优势。 ["款项到账快","汇款通道多","温馨提示","安全又便捷"]
The part of a windlass which physically engages the chain during hauling or paying out is the（）. ["devil's claw","bull gear","wildcat","cat head"]
Emergency generator is installed on board mainly to （） ["connect to the busbar when the load increasing","supply power specially to charging panel","be put into operation during the ship arriving at or leaving port","ensure the power supply to critical equipment after the main switchboard out of power"]
The most serious effect of air trapped in a diesel engine jacket water cooling system is that it（）. ["causes colloid suspension in the cooling water","reduces the capability of the lubrication system","can form pockets which block the flow of coolant through the system","leads to the scuffing of cylinder wall"]
飞机无法航化作业的地块、飞机航化过的地块边角不能防到的位置，采用（）防病，做到病害防控无死角，人工防病100%采用（）进行作业。
