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【单选题】
关于比较器输入电压 、 之间的关系,下列说法错误的是( )。A.
是固定不变的电压值
B.
是固定不变的电压值
C.
当 > 时，比较器输出 接近电源电压，蜂鸣器两端的电压差不足以使蜂鸣器工作
D.
当 < 时，比较器输出 接近0V，蜂鸣器两端的电压差足够大，蜂鸣器正常工作
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【单选题】After ______ on his couch more than a dozen times, he gave up his attempt to sleep.
A.
he overturned
B.
his having turned over
C.
turning over
D.
turning up
【简答题】A．He put it back on the ground. B．He put it into his own pocket. C．He threw it into a trashcan. D．He gave it to the police.
【简答题】To prepare for the interview, he had put on his best suit and polished his shoes，and now, as he entered the office，he wore a ______ smile on his face． 为了面试，他穿上了最好的衣服，擦亮了皮鞋，现在他走进办公室时，脸上带着动人的微笑。
【单选题】He ______ his textbooks when he left school and never reopened them.
A.
put back
B.
put aside
C.
put down
D.
put off
【简答题】广义的质量包括( )。A. A.产品质量和工作质量
【简答题】We wish he ______ his overcoat. A) does put on B) had put on C) will put on D) has put on
【多选题】（1分）广义制造的含义包括：A 产品设计B 材料选择、制造生产C 管理营销质量保证D 管理营销等内在联系的运作与活动
A.
产品设计
B.
材料选择、制造生产
C.
管理营销质量保证
D.
管理营销等内在联系的运作与活动
【单选题】He ________ his work to spend more time with his son. [ ]
A.
put down
B.
put aside
C.
put in
D.
put away
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