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【多选题】
电流互感器接线形式有（ ）。A.
单相接线
B.
星形接线
C.
不完全星形接线
D.
三角形接线
拍照语音搜题，微信中搜索"皮皮学"使用
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【单选题】— What was the _________________________ the day before yesterday? —It was April 6th.
A.
temperature
B.
day
C.
time
D.
date
【单选题】Before the 20th century the horse provided day-to-day transportation in the United States. Trains were used only for long-distance transportation. Today the car is the most popular【C1】______of transpo...
A.
kinds
B.
sort
C.
means
D.
types
【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】Helen will have that dress altered to fit her．
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