在加热炉停炉操作中，正常停炉时，提前（）h缓慢降低炉温。
A.1—2
B.2—3
C.3—4
D.4—5
参考答案：D
— ______________ jacket is this?
— Maybe it's Tom's. [ ]
A. Who
B. What
C. Whose
D. Where
尚药局
