评价空气的洁净度等级需要检测悬浮粒子数和微生物数。（ ）
A. 对
B. 错
植入器械细菌内毒素检测方法是家兔法。（）
A. 对
B. 错
straggle
A. to grow, spread or move in an untidy way in different directions
B. to use power or influence to affect somebody or something
C. to remove something off
crest
A. the middle part of a hill or wave
B. the top part of a hill or wave
C. the lower part of a hill or wave
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