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【简答题】
如本任务讲到单片机点亮LED所用到的电路,代号为D1的LED负极连接单片机的端口P1.0,其正极通过限流电阻连接到电源的VCC,我们发现,当通过编程设置单片机的P1.0端口数字量为( )时,该LED将会导通而发光!因为单片机执行该,通过内部电路将P1.0端口连接到单片机的零电位点GND,这样该LED电路连接VCC一端电位高,通过单片机连接GND的一端段位低,LED符合( )条件,电流将会从( )流经限流电阻和LED通过单片机流到GND,即电流从电源( )流出经过LED发光电路流回( )构成通路。(请选用“3”“2”“1”“0”“截止”“放大”“导通”“GND”“饱和”“负极”“正极”“VCC”)
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【单选题】The text seems to suggest that ______.
A.
while in America, do as the Americans do
B.
most Americans are impatient
C.
when you are riding a bus in the U. S. , be careful of the angry driver
D.
if you want to get help from American city people, please let them know
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【单选题】“bridge out” wouldactually mean “Meet me.” 40 However, it is also hard to keep a code booksecret for long. So codes must be changed frequently.
A.
It is very hard to break a code without the code book.
B.
In any language, some letters are used more than others.
C.
Only people who know the keyword can read the message.
D.
As long as there have been codes, people have tried to break them.
G.
You can hide a message by having the first letters of each word spell it out. F. With a code book, you might write down words that would stand for other words. G. Another way to hide a message is to use symbols to stand for specific letters of the alphabet.F. G.
【单选题】The job is to me because I have little experience, however, it is also . [ ]
A.
challenging; rewarding
B.
challenged; rewarded
C.
challenging; rewarded
D.
challenged; rewarding
【单选题】However, it is also the language used to report financial information about ( nonprofit) organizations...
A.
charitable
B.
profit-hungry
C.
not-for-profit
D.
nonmoral
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