____________ pencils are there in your bag?[ ]
A. How old
B. How many
C. How
答案:B
下列不属于物理灭菌法的是
A.紫外线灭菌
B.环氧乙烷
C.丁射线灭菌
D.微波灭菌
E.高速热风灭菌
节流阀