【单选题】【消耗次数：1】
普雷马克原理是指（ ）
①
A、用低频活动作为高频活动的强化物
②
B、用高频活动作为低频活动的强化物
③
C、用低频活动作为低频活动的强化物
④
D、用高频活动作为高频活动的强化物
参考答案：
复制
纠错
相关题目
【单选题】
5G关键技术中的全频谱接入技术涉及（）以下低频段和（）以上高频段，其中低频段是5G的核心频段，用于无缝覆盖；高频段作为辅助频段，用于热点区域速率的提升。。
①
4GHz，6GHz
②
6GHz，6GHz
③
6GHz，8GHz
④
8GHz，8GHz
【单选题】
RFID系统根据使用频率的不同，可分成低频RFID、高频RFID、超高频及微波RFID四种，日常使用的学校食堂饭卡系统通常属于()。
①
低频RFID
②
高频RFID
③
超高频RFID
④
微波RFID
随机题目
【单选题】
You’ d rather have a cup of tea than have a cup of coffee,
_____?
①
wouldn’ t you
②
hadn’ t you
③
would you
④
had you
【单选题】
Without his timely help, we _____ all these in such a short period of time.
①
dont accomplish
②
have not accomplished
③
should not accomplish
④
would not have accomplished
【单选题】
I am sorry I have no time at present to ____ more detail or give you an account of other cities of interest.
①
bring into
②
take into
③
come into
④
go into
【单选题】
He cannot ____ a car, for he does not earn much money.
①
obtain
②
afford
③
donate
④
consume
【单选题】
It’s not fair that you come home after a bad day at
work and ____ your wife and children.
①
take it out on
②
take out it on
③
take out on
④
take on it with
【单选题】
A ____ person is one who is easily hurt or offended by things that people do or say.
①
sensitive
②
sensible
③
smar
④
wise
【单选题】
Don’ t forget to put the book back on the shelf, _____?
①
do you
②
don’ t you
③
will you
④
won’ t you
【单选题】
Beth could ____ her coat because it had large red buttons.
①
recognize
②
prove
③
define
④
claim