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【单选题】
在用六分仪测物标垂直角求距离时,如果要得出较准确距离,物标高度版海图上给出的物标高程加上 。A.
0
B.
当时潮高-平均海面高度
C.
平均海面高度-当时潮高
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举一反三
【单选题】Good secretaries will also ________________the way they dress for work.
A.
is interested in
B.
be good at
C.
be able to
D.
pay attention to
【单选题】What’s the difference between ordinary secretaries and executive secretaries?
A.
Ordinary secretaries work longer hours.
B.
Executive secretaries have more responsibilities.
C.
Executive secretaries work with doctors and lawyers.
D.
Ordinary secretaries work in small companies only.
【简答题】Good secretaries are extremely efficient and well _______ (organize).
【单选题】紫外线用于空气消毒时,有效距离和照射时间为
A.
25cm，20 min
B.
60cm， 30min
C.
2m，30 ～ 60min
D.
1m ，60min
E.
2cm ，120min
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