关于武夷茶名,历代均有变迁,请说出唐朝、宋朝主要茶名?
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()时期,中国的六朝、隋文化通过朝鲜半岛大量传入了日本。
A. 古坟时代
B. 飞鸟时代
C. 弥生时代
D. 绳纹时代
计算题:锅炉上升管的干度x=0.125,求此锅炉的循环倍率是多少?
在农电生产系统中,停电申请执行完后,在()中能查到该停电申请单。
Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished ().
A. during the valve overlap period
B. with only the exhaust valve open
C. at a pressure below atmospheric
D. without cooling the cylinders or pisto