The contraction of muscles uses energy and releases heat.What is the meaning of the ‘release’in the sentence?
A. to let somebody or something come out of a place where they have been kept or trapped
B. to express feelings
C. to free somebody from a duty
D. to make something less tight
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There are hundreds of ___ spiders and snakes.
A.prison
B.poison
C.poisonous
D.prisoner
运算放大器的组成部分有()。
A. 输入级
B. 发射极
C. 中间级
D. 输出级
E. 偏置电路
运算放大器接成负反馈电路,则此运算放大器就工作在线性区。运算放大器工作中线性区的特点有()。
A. 虚地
B. 虚短
C. 虚断
D. 虚输入
运算放大器是集成电路,是相对于由各种单个元件连接起来的分立电路而言的。
A. 对
B. 错