白肋烟晾制后，当晾棚内的相对湿度为（）左右时即可不架剥叶
A. 50%
B. 60%
C. 70%
D. 80%
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气流下降式烤房的主要结构特点之一是（）
A. 火管位于烤房地面
B. 火管位于烤房一面墙壁上
C. 火管在烤房顶部
D. 火管位于任意位置
About 20 of the passengers who were injured in a plane crash are said to be in_____condition ．
A. decisive
B. urgent
C. vita
D. critical
The manager is calling on a______ customer trying to talk him into signing the contract ．
A. prosperous
B. preliminary
C. pessimistic
D. prospective
白肋烟堆积发酵的最适温度为（）
A. 18 ° C －20° C
B. 20° C － 25° C
C. 25° C －28° C
D. 30 ° C －35° C
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