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【多选题】
Which of the following statements regarding chronic bronchitis are TRUE:A.
Chronic bronchitis is defined as persistent productive cough for at least 3 consecutive months in at least 2 consecutive years
B.
Cigarette smoking is the most important risk factor
C.
Air pollutants contribute to chronic bronchitis
D.
The dominant pathologic features are mucus hypersecretion and persistent inflammation
E.
Histologic examination demonstrates enlargement of mucous-secreting glands, goblet cell hyperplasia, chronic inflammation, and bronchiolar wall fibrosis
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【简答题】一横波在沿绳子传播时的波动方程为 . (1) 波的振幅_______m、波速______m/s、频率_______Hz、波长______m; ( 2 ) 求绳上质点振动时的最大速度________m/s(保留2位小数)。 (本填空题全部用小数填写)
【单选题】对平板玻璃进行流通加工,玻璃利用率可从60%左右提高到85%~95%,体现了流通加工的什么作用?
A.
延迟功能
B.
提高原材料利用率
C.
提高加工设备利用率
D.
充分发挥各种输送手段的最高效率
【简答题】10-9 一横波在沿绳子传播时的波动方程为 ,式中y和x的单位为m,t的单位为s. (1)求波的振幅、波速、频率及波长; (2)求绳子上的质点运动振动时的最大速度.
【单选题】Directions: There are two passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should de...
A.
He had his son after eleven years of marriage.
B.
His son is from his wife's previous marriage.
C.
He enjoys becoming his son's close friend.
D.
His son made him talk the way a father should.
【简答题】I left eleven years later, with my school leaving certificate, and a ___(scholar) to study at Oxford.
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