Assuming its trading partner does not retaliate, which of the following conditions must hold in order for a large country to increase its national welfare by imposing a tariff?

[单选题]Which of the following conditions will make a relation that is in first normal form. to be in second normal form?Ⅰ.every non-key attribute is functionally dependent on the full set of primary key attributes.Ⅱ.no non-key attributes exist in the relati

[单选题]Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?（）A . Increased suction head pressureB . Decreased feedwater temperatureC . Pump recirculating line being open too muchD . Excessive feedwater tempera

[单选题]Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?A．Ignition lag increases.B．Lube oil system pressure increases.C．Brake specific fuel consumption increases.D．Mechanical efficiency in

[单选题]Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?A．The mixture is too lean to burnB．The mixture is too rich to burnC．The vapor is about to explodeD．Conditions are perfect for

[单选题]Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?A．Leaking seal ringB．Insufficient heat transfer from the exhaust valvesC．Blocked cooling water passages to the headD．Excessive scavenging air provided

[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 conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle turbo-charged diesel engine?（）A . Clogged air intake faltersB . Piston blow-byC . A defective after-coolerD . Faulty exh

[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]Which of the following does not contain a non-finite clause?A．He swims in the river every day.B．Do you mind my shutting the door?C．It's been nice talking to you.D．There being nothing to do, he left.

[单选题]Which of the following does not contain a non-finite clause?A．He swims in the river every day.B．Do you mind my shutting the door?C．It's been nice talking to you.D．There being nothing to do, he left.