真空蒸发需要哪些辅助设备?
参考答案:
1)冷凝器2)真空装置3)除沫器
颈强直见于下列疾病,但应除外()
A.脑膜炎
B.蛛网膜下隙出血
C.颈椎病
D.颈部炎症
E.脑梗死
-How old is your daughter ?
- . We had a special party for her party yesterday .
A. Nine , nine. B. Nine , ninth . C. Ninth , ninth .