问题
选择题
氨水中所含的分子和离子可能有①NH4+ ②H2O ③NH3 ④NH3·H2O ⑤H+ ⑥OH-其中正确的组合是 [ ]
A.①②③
B.②③④⑤
C.②③④⑤⑥
D.①②③④⑤⑥
答案
答案:D
氨水中所含的分子和离子可能有①NH4+ ②H2O ③NH3 ④NH3·H2O ⑤H+ ⑥OH-其中正确的组合是 [ ]
A.①②③
B.②③④⑤
C.②③④⑤⑥
D.①②③④⑤⑥
答案:D
情景交际:从方框中选择合适的选项完成对话。 | |
A: Hi,Vanessa.I'm Jeff Black from Lives of the Very Famous magazine.__ 1 B: Oh,you're welcome.lt's nice to meet you,Jeff. A: Vanessa,our readers want to know what famous people do for vacation.__ 2 B: Well,I'm going to Italy. A: 3 B: It's beautiful…,and it's always sunny and warm! A: Really? 4 B: oh,going to the beach…maybe playing volleyball… A: 5 B: Oh,yes,going sightseeing,going shopping,you know,the usual… A: And how long are you staying? B: Oh,only for 3 weeks. A: Well,that sounds great. | |
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