28． Which of the following may the author disagree?

A． Sitting up slowly without using your hands helps burn calories．

B． Eating apples every day is good for people's health．

C． You have to join a gym if you want to lose weight．

D． It’s good to walk around while talking on the mobile phone．

[单选题]Which of the following may cause that an engine doesnt run on starting air?（）A . too low starting air pressureB . main start valve closedC . neither A nor BD . A and B

[单选题]Which of the following firing order may be used for a 6-cylinder engine? ( )A．1-2-3-4-5-6B．1-2-3-6-5-4C．1-5-3-6-2-4D．1-3-4-5-6-2

[单选题]Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than specified by the engine manufacturer?（）A . The amount of fuel injected will be increasedB . The start of injection will be retardedC . The no

[单选题]Which of the following conditions may need to be reduced when operating a large, low speed, main propulsion, diesel engine at low loads?（）A . Injection pressuresB . Control air supply pressureC . Cooling water flow through after-coolersD . Lube oil t

[单选题]Which of the following may take place if the clearance of the main bearings are excessive?（）A . bearing knocksB . dropping of pressure of LOC . noisesD . all the above

[单选题]Which of the following firing order may be used for an 6 cylinder engine?（）A . 1-2-3-4-5-6B . 1-2-3-6-5-4C . 1-5-3-6-2-4D . 1-3-4-5-6-2

[单选题]Which of the following may lead to the engine NOT to start on air?（）A . starting air pressure too highB . correct timing of starting air valvesC . three of the six starting valves stuckD . the turning gear disengaged

[单选题]Which of the following conditions may contribute to the formation of deposits on the blades of the turbocharger turbine?（）A . Poor combustionB . High cylinder oil consumptionC . Leaking exhaust valvesD . All of the above

[单选题]28． Which is NOT true?A． The land never stops becoming deserts．B． Scientists ask the people to live in the deserts and grow food there．C． People do bad things to the earth．D． Scientists may not be able to change the deserts．

[单选题]28． Which is NOT true?A．Now in Germany，the teleshopping is more developed than that last year．B． The French spend a lot of money to buy things by teleshopping，C． Some big companies in Sweden are selling things by teleshoppingD． Americans are the firs