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【判断题】
倪老师自编用电子秒表测单摆的周期（单位：s），共测10次，数据记录如下：2.001.96 2.05 1.99 1.96 2.00 1.99 2.03 1.91 1.92 计算这10个数的平均值（保留四位有效数字）为1.980秒。A.
正确
B.
错误
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【简答题】食品厂气力输送系统中应用较多的除尘器是( )和( )。
【简答题】完形填空。 John sent for a doctor because his wife was ill. He called the doctor and made sure they 1 meet at five. He arrived at the doctor's at twenty 2 five. He thought. 'It's a little bit earlier. I'll...
【简答题】设a,b为循环群G的两个元,且|a|=3,|b|=7,那么乘积元素ab的阶|ab|=____。
【简答题】John sent for a doctor because his wife was ill. He called the doctor and made sure they would meet at five. He arrived at the doctor's at twenty to five. He thought, 'It's a little bit earlier. I'll ...
【单选题】Tom's father wants __________him．
A.
making a doctor
B.
a doctor made from
C.
to make a doctor of
D.
to make a doctor by
【多选题】表扬信与感谢信的区别主要体现在以下几点( )
A.
侧重点不同，表扬信以感谢为主 ( 以感谢为主 )
B.
发出者不同，感谢信了解情况的人都可以写（只能受益人发出）
C.
表扬信可以由受益人发出
D.
表扬信可以由了解情况的人发出
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