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【简答题】
用所给动词的适当形式填空 1. When the teacher came in, the students stopped (talk). 2. There (be) a bookstore and two drugstores in the street . 3. I decided (talk) to my parents about it . 4. By the time she got to the cinema, the movie (begin). 5. ( spend ) time with family and friends is very important. 6. You are (suppose) to shake hands when you meet a Chinese friend. 7. Li Ming (ask) to attend the meeting yesterday. 8. I (have) an exciting party last weekend. 9. It's hot. You'd better (not put) on your coat. 10. By the time I got outside, the bus (leave).
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举一反三
【单选题】— Space travel must be very very expensive. — . The cost of a seat on the Virgin craft is $ 250,000.
A.
That’s not true.
B.
Of course.
C.
Why do you think so?
【判断题】销售利润率是由安全边际率和贡献毛益率相乘得出。
A.
正确
B.
错误
【单选题】—The poor people lived near the highway. —_____ very noisy.
A.
It must have been
B.
They must be
C.
That might be
D.
There must be
【单选题】You must be very careful when handling these acids______they are very concentrated.
A.
as
B.
when
C.
if
D.
while
【简答题】1955年,()系创建,为建国后新创办的第一个大学新闻系。
【单选题】___________ 可以用来代替人的劳动,完成有用的机械功或实现能量转换。
A.
机构
B.
构件
C.
机器
D.
零件
【简答题】由CMOS门电路组成的施密特触发器如图7.1.3(a)所示,已知R1=5 kΩ,R2=10 kΩ,VDD=5 V,VOH≈5 V,VOL1≈0 V,VTH1=2.5 V。 (1)计算正向、负向阈值电压及回差电压。 (2)当阈值电压变为 时,若使回差电压不变,对电阻有何要求?此时正向、负向阈值电压为何值?
【单选题】()可以用来代替人的劳动,完成有用的机械功或完成能量转换。
A.
机构
B.
机器
C.
构件
D.
零件
【单选题】可以用来代替人的劳动,完成有用的机械功或实现能量转换。
A.
机构
B.
机器
C.
构件
D.
零件
【简答题】机器可以用来代替人的劳动,完成有用的
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