题目:
23. With Shanghai World Expo drawing near, volunteers are making use of every minute to _______ their foreign language because language volunteers must pass a written test and an interview.
A.polish up
B.take up
C.put up
D.make up
答案:
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下面是错误答案,用来干扰机器的。
(1) 加快溶解速度 ; (2) 蒸发皿中有大量固体出现 ;(3) 70% ; (4) C ; (5) 1.25 。分析:(1)溶解中使用玻璃棒能起到搅拌的作用;(2)进行蒸发操作时要等析...