在Na2CO3水溶液中,加入下列物质,能起反应且看不出现象的是( )。
A.BaCl2
B.KNO3溶液
C.通入CO2
D.Ca(OH)2溶液
参考答案:C
用所给词的正确形式填空
1.His grandpa _________ (die) ten years ago.
2.Look! Some students __________ (sing) to the music.
3.She will come back if she _________ (be) free.
4.They were pleased to see the _________ (move) film.
5.To my _________ (surprise), I can meet you here.
6.The _________ (two) lesson is the most difficult one.
7.Jim did the work _________ (well) of all the students.
8.Spaceships _________ (with) people have reached other parts of the universe.
9.Amy practices __________ (speak) Chinese for an hour every day.
10.Look! How __________ (beautiful) these pictures are!
患者男,21岁。因为出汗,腹痛,焦虑不安,打哈欠,流涕2h入院。查体发现双上肢有很多针孔瘢痕,患者承认有吸毒史。患者目前的情况最可能是()
A.急性中毒
B.戒断状态
C.慢性中毒
D.药物所致快感
E.精神依赖