Camshafts are usually driven by timing gears or （）.

[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]（） 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

[主观题]Miao Yue usually_______(play) computer games on weekends．

[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

[单选题]B．ecause the timing of injection is crucial, _____ mounted on the camshaft, which is driven by the crankshaft are used to operate the fuel pumps, one of which is provided for each cylinder.A．gearsB．ramsC．barrelsD．cams

[单选题]With （） unit the timing of fuel injection of an engine can be regulated automatically.A . MBTB . MEGC . VSGD . VIT

[单选题]With VIT unit the timing of fuel injection of an engine can be regulated automatically according to the （）.A . ship draftB . pitchC . engine loadD . oil viscosity

[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