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【单选题】
以下关于结构图的说法错误的是A.
方框表示元件输入与输出信号的关系
B.
信号线的箭头表示信号流向
C.
信号线对应各个变量
D.
比较点是求两个信号的差值
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【简答题】Because of the high cost of private country clubs, many American families join their neighbors in building a community or______.
【单选题】It's high time that he settled down in the country and () a new life.
A.
start
B.
started
C.
starting
D.
to start
【简答题】TTL集电极开路门必须外接（）才能正常工作。
【简答题】TTL 集电极开路门必须外接 ________ 才能正常工作。
【简答题】A in general B on average C by contrast D at length
【单选题】Secondary and higher education______available to all high school graduates in this country so far.
A.
have made
B.
were made themselves
C.
have been made
D.
were made it
【单选题】What is the effective average sentence length in students’ writing?
A.
An average of 12-20 words
B.
A series of 10-word sentences
C.
A series of 35-word sentences
D.
None of them are right.
【单选题】The approximate average values of weight、length、and head circumference in 1-year-old children are
A.
Weight 15kg, length 65cm, head circumference 46cm
B.
Weight 15kg, length 75cm, head circumference 50cm
C.
Weight 10kg, length 75cm, head circumference 46cm
D.
Weight 10kg, length 65cm, head circumference 46cm
E.
Weight 10kg, length 85cm, head circumference 35cm
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