She ______ down and soon falls asleep()
A. live
B. lain
C. laid
D. sits
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Have you ever seen _____ as tall as this one()
A. a tree
B. such tree
C. an tree
D. tree
ScrollBars属性用来设置文本框是否显示滚动条。ScrollBars有4种状态,其中用于显示垂直条滚动的是()
A. None
B. Horizontal
C. Vertical
D. Both
设有变量说明:char c=’c’;表达式 ’a’<=c && c<=’z’ || ‘A’<=c && c<=’Z’的值为()
A. 0
B. 1
C. True
D. False
电路网络函数等于电路的()
A. 阶跃响应的原函数
B. 阶跃响应的象函数
C. 冲激响应的原函数
D. 冲激响应的象函数