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说明中胚层的出现对动物演化的意义。

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简述华枝睾吸虫的生活史

Duringthelastfewdecadestherehasbeenasignificantchangeineating__intheUK.Sincetheearly1980seatingoutinrestaurantsandcafeshasincreasedsteadily.Thereareseveralreasonsforthistrend.50yearsagomostwomenwereandcookedfortheirfamilieseveryday.Butrecently,withmorewomenworkingoutsidetheirhome,lesstimehasbeen_forfoodpreparation.Currently,71%ofwomenaged20-45areatwork,andby2015itisestimatedthatthiswillriseto84%.Anotherfactoristhegrowthin_whichhasrisensignificantlysincethelate1970s.Withmoremoneyintheirpocketspeoplearemorelikelyto_____thetroublesofshoppingandcookingbyvisitingtheirlocalrestaurants.

烟尘具有一定的粘附性有利于细尘粒凝聚，从而有利于收尘，但粘附性过强会使收尘率下降。

A. 对
B. 错

影响电收尘效率的因素有哪些？

A. 烟气性质（温度、压力、湿度、流速和含尘浓度）
B. 烟尘特性（烟尘粒径、粘附性和比电阻）
C. 烟尘的化学性质
D. 烟尘的耐磨性