【简答题】(2012?盐城)某兴趣小组对食用纯碱和食用小苏打两种粉末进行以下探究. [查阅资料] 名称 食用纯碱 食用小苏打 主要成分 Na 2 CO 3 NaHCO 3 酸碱性 水溶液显碱性 水溶液显碱性 热稳定性 受热不分解 270℃时完全分解为碳酸钠、二氧化碳、水 (1)探究两者水溶液酸碱性的差异 小明分别向等浓度的两种溶液中滴入酚酞试液,发现两者都变 色,但食用纯碱溶液中颜色更深,由此推测可能 溶液...
【单选题】What is said about Twitters business model?
A.
There has been a complete set of business model since Twitter was established.
B.
Twitter's employees are encouraged to have brainstorms for better business model.
C.
Twitter has worked out detailed business model about how to support itself.
D.
With the passage of time. Twitter has managed to improve its business model.
【简答题】A 新斯的明 B 毒扁豆碱 C 肾上腺素 D 噻吗洛尔 E 毛果芸香碱 1 通过抑制AChE的活性,滴眼可用于治疗青光眼的药物是() 2 直接激动M受体,引起缩瞳,可治疗青光眼的药物是() 3 通过阻断β受体,使房水生成减少而用于治疗青光眼的药物是() 4 通过激动肾上腺素受体,而用于治疗青光眼的药物是()
【判断题】The G2C business model allows citizens to interact with government agencies online.