______、______、______是恙虫病的基本病变。
参考答案：全身小血管炎；血管周围炎；网状内皮细胞增生
Every ship shall carry personnel qualified for（）to the satisfaction of the Administration.
A.distress and safety radio communication purposes
B.life-saving purpose
C.GMDSS requirements
D.emergency position
并行数据库系统是在并行机上运行的具有并行处理能力的数据库系统。
