对健康人和儿童预防接种的方法是
A、人工主动免疫A
暂无解析
Touristexpenditureshavedifferenteffectsonadestinationeconomy:salesbyfoodvendorstorestaurantsare_______effect;whiletaxifaresandairlineticketsalesare_______effect.
Importswillbeallowedinproportion_______exports.
Sofarscientistshaveonlyacquired________understandingofthephysicalprocessesthatcauseearthquakes.
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Wearepleasedtoinformyouthattheitemyourequestedcanbesupplied______stock.