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【单选题】
用示波器显示两个变量 a 与 b 的关系时, a 、 b 分别接在示波器的 Y 、 X 通道,显示图形为椭圆,则:A.
a 与 b 同相，且幅度相同
B.
. a 与 b 相差 90 度，且幅度一定相同
C.
a 与 b 相差 90 度，但幅度不一定相同，其关系依 X 、 Y 输入增益而定
D.
. a 与 b 幅度、相位关系不能确定
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【简答题】LCL/LCL refers to the both consignors and consignees are less than two．（ ）
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A.
he called her 'The Believer'
B.
her belief in him was a constant encouragement
C.
from the earliest days of their relationship, she always encouraged her husband to build a horseless carriage
D.
she often reminded her husband that the way to make automobiles is to make them all alike
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A.
正确
B.
错误
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