患者经期发热,腹痛,经色紫暗,夹有血块;舌暗,舌边有瘀点,脉沉弦数。其证候是()
A.瘀热壅阻证
B.血气虚弱证
C.肝肾阴虚证
D.痰热郁阻证
E.肝郁气滞证
参考答案:A
Rainmaking Scientific rainmaking was started by Vincent J. Schaefer after the year of (1) . A lucky (2) brought him to success. Schaefer was hired, during World War II, by Dr. Irving Langmuir to study how and why (3) forms on the wings of airplanes. The two went to New Hampshire because (4) were common and cold winds often blew. In New Hampshire, they were surprised to learn that the temperature of the clouds surrounding them was far below the (5) , and yet ice did not form there. After the war Schaefer went on the experiment. One morning a friend asked him to go for lunch. He went and left the (6) of the freezer up. When he returned from lunch, he found the temperature of the freezer was (7) than that required for ice crystals to remain solid. There were two choices now. He could wait for the freezer to lower the air temperature or he could add (8) ice. He chose the latter. Then when he did this, he happened to (9) a large amount of air. Suddenly he saw (10) were formed. He did the experiment again and succeeded in making a tiny snowstorm in the laboratory.
学生将新学的概念“橡皮擦”归到“文具”这一总的概念中,这种学习属于()。
A.下位学习
B.同位学习
C.上位学习
D.并列学习