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【单选题】
用测观测水平角，若右方目标的方向值α右小于左方目标的方向值α左时，水平角β的计算方法是( )。A.
β=α左-α右
B.
β=α右-180°-α左
C.
β=α右+360°-α左
D.
β=α右-α左
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【单选题】《产品质量法》所称的“缺陷”不包括哪一项？
A.
产品的外形缺损
B.
产品存在危及他人财产安全的不合理危险
C.
产品有保障人体健康的国家标准、行业标准的，是指不符合该标准
D.
产品有人身、财产安全的国家标准、行业标准的，是指不符合该标准
【单选题】If you have three subjects to review in three days, the best method is _________.
A.
to review one subject a day
B.
to divide the time equally between the three subjects in each day
C.
to review whatever you like
D.
to review the most difficult subject in three days
【单选题】The artist __ the judge gave a prize is the teacher __ I have been taught painting for over three years.
A.
from whom; by whom
B.
to whom; who
C.
whom; who
D.
to whom; by whom
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