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【单选题】
锯割管材时,应当选择( )锯条。A.
粗齿
B.
中齿
C.
细齿
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举一反三
【单选题】I looked under ______ table and found ______ pen he lost the day before yesterday. [ ]
A.
the; a
B.
the; the
C.
/; the
D.
the; /
【单选题】When Helen saw her tutor nod ________ to her, she calmed down and went on with her performance. [ ]
A.
encouragingly
B.
amazingly
C.
interestingly
D.
accordingly
【单选题】Is this museum _______some German friends visited the day before yesterday?
A.
which
B.
that
C.
where
D.
the one
【单选题】Helen apologized for ______ to attend the party.
A.
her not being able
B.
her being not able
C.
her to be not able
D.
her not to be able
【简答题】A.Helen is similar to her mother. B.Helen will be a good police. C.He likes Helens mother. D.He knows Helen very well.
【多选题】A/D转换是数据采集的第一步,就是选择合适的A/D转换芯片,将传感器送来的模拟信号,转换成数字信号,以便于单片机、PC机等进一步运算处理。通常选择A/D转换芯片时,需要考虑()。
A.
位数。如8位、10位、12位等，它体现的是将一定的模拟信号转换成相应位数的二进制数据。
B.
转换速度。衡量采集数据的速度，通常用一秒钟可以进行的转换次数来衡量，如1M SPS ，表示一秒钟可以进行1M，即1百万次转换。
C.
信号输入范围。表示信号可以输入的电压范围。
D.
输入通道类型。如差分输入，单端输入。
【单选题】Is this factory _____ you and your mother visited the day before yesterday? [ ]
A.
that
B.
which
C.
the one
D.
where
【简答题】The day before the day before yesterday is three days after Saturday. What day is it today?
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