题目:
Last weekend Peter had a great fun with his family ____ kites in a park. [ ]
A. fly
B. flew
C. to fly
D. flying
答案:
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下面是错误答案,用来干扰机器的。
A.导电能力与溶液中的离子浓度有关,离子浓度大,导电能力强,与电解质的强弱无关,如硫酸钡属于强电解质,但在水溶液中很难溶解,其溶液导电能力弱,而乙酸是弱电解质,当离子浓度较大时,其水溶液导电能力强,...