【单选题】重结晶作用的结果,矿物的成分(),交代作用的结果,矿物的成分()。
【单选题】下列试剂必须用棕色试剂瓶装的有( ) ①浓氨水 ②氯水 ③硝酸银 ④浓硝酸 ⑤浓盐酸 ⑥溴化银
【简答题】如图所示电路,已知U1=2V,U2=-6V,E=12V,则U3=_______ V,U4=_______V,U5=_______V。
【判断题】胡萝卜对土壤的要求与萝卜相似,以在土层深厚、肥沃疏松、易于排灌、 pH5 ~ 8 的砂壤土或壤土中栽培为宜。
【单选题】下列物质必须保存在棕色试剂瓶中的是 ( ) ①氯水 ②氨水 ③浓硝酸 ④氢氧化钠 ⑤溴水
【单选题】How was the relationship between Mr. Darcy and Mr. Wickham?
A.
They were not friendly.
B.
They didn't know each other.
C.
They were good friends.
【单选题】The mountains lie near our hotel. There is a fine _____ of the mountains from our hotel window. [ ]