Mechanical lifting of air by the upslope slant of the terrai

An automobile sling is used for ________

A.lifting aircraft and helicopters

B.lifting any kinds of cargo

C.lifting the heavy boxes

D.lifting cars and trucks

What cargo does a jumbo boom or heavy derrick used for lifting?

A.MECHANICAL-ELECTRO-MICROSYSTEMS

B.MICRO-ELECTRO-MECHANICALSYSTEMS

C.MICRO-MECHANICAL-ELECTROSYSTEMS

D.ELECTRO-MICRO-MECHANICALSYSTEMS

Which safety precaution（s）should be observed during crane operations ________．

A.Checking for proper lifting from beneath the load during cargo operations

B.Using the proper slings or other lifting devices during cargo operations

C.Relaying communications to port agents on the pier during cargo hoists

D.All of the above

Personnel who are moving or handling material aboard ship should NOT follow which of the listed practices?

A.Signaling that all personnel are clear before lifting or lowering material

B.Examining material for sharp edges or protruding points before handling

C.Closing, tagging or securing valves that permit entrance of steam, water, or air into a fitting or other equipment

D.Throwing materials from high places to the deck

A. meaningful drilling and communicative drilling

B. mechanical drilling and meaningful drilling

C. mechanical practice and meaningful practice

D. meaningful practice and communicative practice

A、mechanical drilling and meaningful drilling

B、mechanical practice and meaningful practice

C、meaningful drilling and communcative drilling

D、meaningful practice and communicative practice

机械性传播(mechanical transmission)

题干材料：Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be impracticable to maintain ambient conditions within the comfort zone by air conditioning or any other means. The normal practice is to provide copious mechanical ventilation; in boiler rooms, the quantity is equated to the combustion requirements, while in a motor ship engine room the supply may be 25-50% in excess of the requirements of the engines.

The axial flow fan is particularly suited to handle these large air volumes at the moderate pressures required, while of course the “straight-through” flow feature places it at an advantage over the centrifugal fan.

The increasing adoption of automation, with the provision of a separate control room makes less significant the fact that comfort conditions cannot be maintained in the engine room all the time.

问题：Which of the following devices should be taken to maintain ambient conditions of the boiler and machinery space?

A.air compressor

B.air cooler

C.air-conditioning plant

D.mechanical ventilation plant

In a motor vessel, the air quantity which the engine room need is_______ of the requirements of the engines.A.less than 25-50%

B.more than 125-150%

C.more than 25-50%

D.less than 125-150%

According to this passage, which of the following statements is true?

A.In boiler and machinery spaces, there is the air conditioning

B.In the boiler rooms the requirement of air volume should meet 25-50% of combustion requirement

C.To maintain the comfort zone in the separate control room the air conditioning plant should be fitted

D.The comfort conditions can be maintained in the engine room all the time

At the middle pressure and large air quantity,_________ is more suitable.A.an axial flow fan

B.a radial flow blower

C.a centrifugal fan

D.an auxiliary blower

请帮忙给出每个问题的正确答案和分析，谢谢！

The universal lifting spreader is a lifting device used on ______．

A.dockside container cranes

B.shipboard container cranes

C.straddle trucks

D.straddle cranes