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【单选题】
一些不太重要、受力不大、尺寸较小、结构简单的齿轮可直接选( )。A.
铸造毛坯
B.
锻造毛坯
C.
铸钢毛坯
D.
棒料毛坯
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举一反三
【单选题】Despite improvements in treatment for asthma, the death rate from this disease has doubled during the past decade from its previous rate. Two possible explanations for this increase have been offered....
A.
Urban populations have doubled in the past decade.
B.
Records of asthma deaths are as accurate for the past twenty years as for the past ten years.
C.
Evidence suggests that bronchial inhalers make the lungs more sensitive to irritation by airborne pollen.
D.
By tem|X)rarily relieving the symptoms of asthma, inhalers encourage sufferers to avoid more beneficial measures.
E.
Ten years ago bronchial inhalers were not available as an asthma treatment.
【简答题】A new study suggests dring soda might _ the risk for respiratory disease like asthma and chronic obstructive pulmonary disease (COPD).
【单选题】Asthma ( 哮喘 ) is thought to be a disease partly linked ________ air pollution.
A.
in
B.
to
C.
on
D.
for
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