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【单选题】
声相关计程仪测得的船速v与前后两换能器间距离s及信号延时的关系是_______。A.
v分别与S和τ成正比
B.
v分别与s和τ成反比
C.
v与s成正比，与τ成反比
D.
v与τ成正比，与S成反比
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【简答题】阅读理解。 On New Year's Day, many people eat special food for good luck. In some Latin American (拉丁美洲) countries, people eat twelve gs at 12 o'clock on New Year's Eve-one g for good luck in each m...
【单选题】--_________ you good luck in the new year. -- The same to you.
A.
Hope
B.
Went
C.
Wish
D.
Like
【单选题】These farmers got a good harvest last year, so they ______ a big sum of money for new farm machines.
A.
set aside
B.
set about
C.
set up
D.
set back
【单选题】单项选择。 — Happy New Year! — ______. [ ]
A.
Happy too
B.
The same to you
C.
Good
D.
Good luck
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