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【判断题】
Die Frau hat eine Kommode. Michael hat auch eine.A.
正确
B.
错误
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【单选题】The basic principle of radar is illustrated by what happens when one shouts in a e. The echoof the shouting 11 the walls helps a person determine the size of i cave. With radar, however , the waves ar...
A.
through
B.
for
C.
on
D.
against
【单选题】What type of radar can activate a racon?
A.
X-band radar.
B.
S-band radar.
C.
C-band radar.
D.
No radar can.
【简答题】f(x)，g(x)在有理数域Q上有公根，则在实数域R上有公根． f(x)，g(x)，在实数域R上有公根，则在有理数域Q上有公根．
【单选题】When the host tops up everyone's cups of green tea, whose cup should they top up first?
A.
Their own cup should be topped first.
B.
The cup of the eldest female at the table.
C.
The cup of the person sitting next to the host.
D.
The cup of the youngest person at the table.
【单选题】A radar contact will remain stationary on a relative motion radar display only when it is ().
A.
On the same course as your vessel
B.
At the same speed as your vessel
C.
On the same course and speed as your vessel
D.
On a reciprocal course at the same speed as your vessel
【简答题】Welding machine also can convert alternating current into ______current.
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