为防止炉膛爆炸，可在点火前开动引风机给锅炉通风()min。
A. 3～5
B. 4～8
C. 5～10
D. 10～20
查看答案
A．involvedB．informedC．collectedD．caught
A. involved
B. informed
C. collected
D. caught
U盘在读写时不能取出，否则可能会损伤U盘。()
A. 正确
B. 错误
Food manufacturers don't want to label packages with sodium content because______
A. they disagree with the FDA
B. salt doesn't stick to potato chips
C. they would have to spend more money
D. it isn't important to single our salt
计算从A国、B国取得的所得分别应当补缴的个人所得税为()元。
A. 0
B. 1100
C. 1200
D. 1300
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