On which days did the tourists spend most of their time on the boat?
A. Monday and Tuesday. B. Tuesday and Wednesday.
C. Wednesday and Thursday. D. Monday and Wednesday.
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A. Monday and Tuesday. B. Tuesday and Wednesday.
C. Wednesday and Thursday. D. Monday and Wednesday.
A.甲苯B.硝基苯C.2-甲基丙烯D.2-甲基丙烷
1.外出购物
2.替房东还书
3.Tracy 来电话留言:1)咖啡屋(Bolton Coffee)见面取消
2)此事已告知Susan
3) 尽快回电
注意:1. 词数100左右;
2.可以适当增加细节,以使行文连贯。
Mrs. Wilson,
A. Tiring. B. Expensive. C. Enjoyable. D. Quick.
A.该溶液的pH=4
B.升高温度,溶液的pH增大
C.此酸的电离平衡常数约为1×10-7
D.由HA电离出的c(H+)约为水电离出的c(H+)的106倍