压力蒸汽灭菌必须每锅进行的监测（）
A.工艺监测
B.化学监测
C.生物监测
D.日常监测
E.强度监测
参考答案：A
因为a=2×3×5；b=2×2×2×3；所以a和b的最大公因数是______，a和b的最小公倍数是______．
One of the collectors collected some seeds from a tree that had ________ him. [ ]
A. interest in
B. appealed to
C. been attracted
D. drew attention of
