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【单选题】
下列叙述正确的是（ ）A.
25℃时，MgCO 3 饱和溶液中c（Mg 2+ ）=2.6×10 -3 mol?L -1 ，CaCO 3 饱和溶液中c（Ca 2+ ）=5.3×10 -5 mol?L -1 ，向浓度均为0.1 mol?L -1 的MgCl 2 和CaCl 2 混合溶液中逐滴加入0.1 mol?L -1 的Na 2 CO 3 溶液，首先生成CaCO 3 沉淀
B.
向硫酸亚铁溶液中加入氯水，再加入KSCN溶液，溶液变为红色，说明硫酸亚铁溶液中存在Fe 3+
C.
溶液中加入盐酸酸化的氯化钡溶液，有白色沉淀生成，该溶液中一定含有SO 4 2-
D.
除去Cu粉中混有的CuO，可将混合物加入到稀硝酸中，充分反应后过滤、洗涤
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【简答题】Choose the best answers to complete the paragraph. My friend and I are planning a trip to Brazil. We're going to save money by staying in 1 and camping on the beach. I hope we have nice 2 ! We want t...
【单选题】Choose the best answer to complete the paragraph. My friend and I are planning a trip to Brazil. We're going to save money by staying in ________ and camping on the beach. I hope we have nice ____2___...
A.
clubs
B.
travel
C.
weather
【简答题】—I wonder whether Brazil will win the match later tonight. —Go to bed first.I will wake you up as soon as the match .A. starts B. started C. will start D. is starting
【简答题】阅读理解。 1. The match is between Brazil and _________. A. Argentina B. China C. Germany D. Japan 2. If Marry wants to be the assistant, she can phone the number _________. A. 833059 B. 383539 C. 383359 D...
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【单选题】下列哪一项不是复层扁平上皮的特点
A.
上皮各处厚度不等，表层细胞为扁平形
B.
只有基底层细胞附着于基膜
C.
基底层细胞为矮柱状，细胞质嗜碱性较强
D.
表层细胞最幼稚，可不断分裂增殖
E.
中间层细胞为多边形
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