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【单选题】
一个位只能表示两种状态,即( )和1。
A.
0
B.
2
C.
3
D.
4
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【单选题】— Linda has changed a lot! She's so quiet! — You're right. She _____ noisy. [     ]
A.
uses to be
B.
used to be
C.
uses to being
D.
used to being
【单选题】在电容滤波的桥式整流电路中,若变压器二次侧电压为 ,则整流输出电压的平均值为( )。
A.
1.2U
B.
0.9U
C.
0.45U
D.
U
【简答题】翻译下面句子: H o w e v e r , another idea has been widespread among m a them a ticians a t least since the time of the ancient Greeks, and its st a tement d a tes back to Pl a t o , w hose di f f erent vie...
【多选题】机电一体化系统中常用线性传动部件包括
A.
减速装置
B.
丝杠螺母副
C.
蜗轮蜗杆副
D.
凸轮机构
【单选题】在有电容滤波的单相桥式整流电路中,若要保证输出电压为45V,则变压器二次电压有效值应为( )。
A.
37.5V
B.
45V
C.
50V
D.
100V
【单选题】在有电容滤波的单相桥式整流电路中,若要保证输出电压为45V,则变压器二次电压有效值应为()V。
A.
37.5
B.
45
C.
50
D.
100
【单选题】Tina isn’t so quiet as she . She is much more outgoing now.
A.
did
B.
used to
C.
was used to
D.
used to be
【单选题】I’m quiet, but Laura likes talking with people. So she is _______ than me.
A.
outgoing
B.
more outgoing
C.
outgoinger
D.
the most outgoing
【判断题】地球生物圈的能量来自光合作用
A.
正确
B.
错误
【单选题】Passage 1 Question 1
A.
B.
C.
D.
D
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