If you were being assisted by an icebreaker and he sent you the single letter Q，he would be telling you（）.
A. that he has his engines in reverse
B. that he is shortening the distance between vessels
C. to shorten the distance between vessels
D. that his vessel is healthy
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乙酰水杨酸原料需要作澄清度检查，这项检查主要是检查（）。
A. 酚类杂质
B. 游离水杨酸
C. 游离乙酸
D. 苯酯类杂质
侵占学校及其他教育机构的校舍、场地及其他财产的，依法承担（）。
A. 民事责任
B. 刑事责任
C. 一般责任
D. 行政责任
对四环素不敏感的病原体是（）
A. 肺炎球菌
B. 绿脓杆菌
C. 脑膜炎球菌
D. 肺炎支原体
E. 立克次体
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