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【单选题】
传统点火系的点火过程可以划分为的三个阶段是A.
触点打开-触点闭合-火花放电
B.
点火开关接通-触点闭合-点火开关断开
C.
触点闭合-触点打开-火花放电
D.
触点闭合-火花放电-触点打开
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【简答题】对某边进行往返观测，得观测值分别为87.213m和87.226m，则观测结果为 m。
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A.
for all industries to stop production
B.
for us to stop using automobiles
C.
for the farmers to stop using fertilizers and festicides
D.
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A.
air
B.
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C.
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D.
noise
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A.
improves
B.
will be improved
C.
has improved
D.
was improved
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A.
the amount of
B.
rely on
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deal with
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【简答题】对某边进行往返观测,得观测值分别为87.213m和87.226m,则观测结果为 ,相对误差为 。
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