单选题 When pumping down an air conditioning system to test the low pressure cutout switch, you should____.

单选题 In the case of the medium speed engine the output speed of the engine must be reduced to one more suitable for the propeller. This is done using a reduction___.

单选题 Compression of the charge of air takes place and fuel is injected into the hot compressed air as___is approached.

单选题 With___, the engine needs not to be aligned with reduction gears or propeller shaft.

单选题 The increasing demand for___propulsion and DP class 2 and class 3 vessels, requires system redundancy with physical separation.

单选题 The process of scavenging in a four-stroke/cycle diesel engine occurs during the___.

单选题 Nowadays, there are two kinds of propellers: one is fixed propeller, the other is the___.

单选题 At___, the exhaust valve and the inlet ports are both open at the same time.

单选题 Scavenging in a four-stroke/cycle diesel engine occurs during the___.