【单选题】【消耗次数：1】
可逆计数器是既可作加法又可作减法计数的计数器。该说法（ ）
①
正确
②
错误
参考答案：
复制
纠错
相关题目
【单选题】
关于高速计数器的说法错误的是（）
①
单相单计数输入高速计数器不能进行减计数
②
单相双计数输入高速计数器有一个增计数输入端和一个减计数输入端
③
双相高速计数器由A相和B相信号决定是增计数还是减计数
④
通过特殊辅助继电器可以控制单相单输入高速计数器的计数方向
【单选题】
8051单片机的定时器/计数器，本质上就是计数器，下面说法正确的是：（ ）。
①
当对外计数时就是定时器
②
当对内部机器周期计数时就是定时器
③
不允许对外计数
④
不允许对内部计数
随机题目
【单选题】
Mr. Robinson knew that the most trivial chore could
prove to be a ____ if approached with enthusiasm.
①
prize
②
reward
③
refund
④
bonus
【单选题】
When Ann broke the dish she tried to put the ____ back together.
①
fragments
②
pieces
③
bits
④
slices
【单选题】
I really do not know whether we can succeed, so do
not expect ____.
①
too much of us
②
us too much
③
of us too much
④
us of too much
【单选题】
Frank almost never received any education, ____?
①
would he
②
did he
③
didn’t he
④
wouldn’t he
【单选题】
The teeth are ____, but they look very natural.
①
false
②
correct
③
fake
④
unnatural
【单选题】
You should know better than ____ your little sister at
home by herself.
①
to leave
②
leaving
③
to have left
④
left
【单选题】
There _____ a basketball match between Class One and Class Three this afternoon.
①
is going to be
②
will have
③
are going to be
④
is going to have
【单选题】
A well written composition ____ good choice of words and clear organization among other things.
①
calls for
②
calls on
③
calls up
④
calls off
【单选题】
A large part of a person’s memory is ____ words and combination of words.
①
by means of
②
in terms of
③
in connection with
④
by way of