简述制丝线生产上供水纯净度的要求?
参考答案:
制丝线生产上供水纯净度的要求,水内不含有杂质,不含有有机物,PH值为6.
Beyond, a famous rock band, played its last concert in 2005 and then it officially ______ in Singapore.
A.broke down
B.broke in
C.broke up
D.broke out
关于儿童良性癫痫伴有中央颞部棘波,叙述正确的有()
A.5~10岁发病最为多见
B.大多数病例仅在睡眠中发作
C.发作相对稀疏
D.脑电图的特征在于一侧中央颞部棘波,多为双相形态,清醒中频繁出现
E.预后良好,青春期早期有自行缓解的趋势