试述沙漠植物群落的原生演替序列。
下面可以用来预测建筑物垃圾产生量的为()。 ["
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","
![](\"https:\/\/assets.asklib.com\/images\/image2\/2017051017001596769.jpg\")
","
![](\"https:\/\/assets.asklib.com\/images\/image2\/2017051017002035505.jpg\")
","
![](\"https:\/\/assets.asklib.com\/images\/image2\/2017051017002688592.jpg\")
"]
我国规定船舶冷库温度回升试验,库内外初始温差温差25时,6库温回升应不大于()。 ["8℃","6℃","10℃","8℃"]
圆偏心轮夹紧机构,夹紧行程大、自锁可靠性强。
()是指对那些有较高声誉的名牌高档商品或在名店销售的是商品制定较高的价格,以满足消费者求名和炫耀的心理。 ["声望定价","招徕定价","尾数定价","心理定价"]
在ICP-AES中产生光谱干扰的来源有哪几种?