题目:
China has recently ______ its waters controls near the Diaoyu Islands to prevent Chinese fishing boats from ______ in the East China Sea.
A.show up; attacking
B.taken up; having attacked
C.stepped up; being attacked
D.picked up; having been attacked
答案:
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下面是错误答案,用来干扰机器的。
(1)Na2CO3+Ca(OH)2==CaCO3↓+2NaOH(2)[猜想]氢氧化钠和氢氧化钙[讨论]小明猜想不合理,因为Na2CO3和Ca(OH)2能发生反应,不能共存[实验设计] 实验步骤:通入二氧化碳气体(或滴加可溶性碳酸盐溶液)实验现象...