无线电业余业务是供业余无线电爱好者作下列用途的无线电通信业务：（）
A、自我训练、相互通信和技术研究A
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We____somebrochures____toillustratethetypesofmaterialswemanufacture.
Pleasewriteareport________theabovesubjectsaretobecovered.
Touristexpenditureshavedifferenteffectsonadestinationeconomy:salesbyfoodvendorstorestaurantsare_______effect;whiletaxifaresandairlineticketsalesare_______effect.
Thenewspaperwillhavetoclosedownifitcannotincreaseits________considerably.
Hefound_______difficulttostudymaths.
