（） is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.

[单选题]_______is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.A．An air receiverB．An operating valveC．An automatic valveD．An air distributor

[单选题]Camshafts are usually driven by timing gears or （）.A . push rodsB . chain drivesC . rocker armsD . flywheel

[单选题]An electrically driven automatically operating auxiliary blower is provided for slow speed and （） of a low speed diesel engine.A . manoeuvring operationsB . bad combustionC . coolingD . mooring trial

[多选题] Message Driven Bean的特点包括（）A . 它是匿名的B . 它具有本地或者远程接口C . 它由容器异步调用D . 该Bean完全在一个容器范围内存活，容器管理它的生命周期和环境

[单选题]Modem engines （） exhaust gas driven turbo-chargers to supply pressurized fresh air for scavenging and supercharging.A . make use ofB . have made the use ofC . by means ofD . make advantage of

[单选题]Modern engines （） exhaust gas driven turbo-chargers to supply pressurized fresh air for scavenging and supercharging.A . are made ofB . are made fromC . make use ofD . are used to

[单选题]Such an engine frame helps （） the engine and so protect the bearings from the deformation forces transmitted via the ships double bottom.A . to stiffenB . to softenC . to loosenD . to wear

[主观题]C．hocolate is usually the _________(child) favorite food.

[单选题]A beneficiary usually refers to（ ）.A.the sellerB.the buyerC.the advising ba

[单选题]A beneficiary usually refers to（ ）.A.the sellerB.the buyerC.the advising ba