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English Corner Recruitment We are recruiting new members. Those with a keen love of English may like to join us. The English Corner is a 25-year-old student-run organization which has enjoyed great popularity among students for many years. It was established to provide an environment for students with a common interest to be able to practice speaking and listening. Our activities, which are held every Thursday, center around providing a safe and cheerful environment and useful topics which will improve our members’ English language skills and promote friendship and fun. We also show classical English movies free of charge to our members. Come and join us if you have an interest in English. Interested students please call 8586368 or send an email to englishcorner@126.com.
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举一反三
【单选题】A half-wave rectifier is connected to a AC source of 20 . The dc output voltage is ( ).
A.
19.3 Vdc
B.
13.65 Vdc
C.
6.14 Vdc
【判断题】Only the positive half-cycles of the source voltage appear across the load in the half-wave rectifier circuits.
A.
正确
B.
错误
【简答题】教材163页,教学互动7-2。 原本方案的总信用成本=_______万元; 经计算,新增收账费用的上限=_______万元。
【简答题】已知一个数列从0项开始的前3项:0,0,1,以后的各项都是其相邻的前3项之和。下列给定的程序中,函数fun()的功能是:计算并输出该数列前。项的平方根之和sum。n的值通过形参传入。例如,当n=10时,程序的输出结果应为23.197745。 请改正程序中的错误,使它能得出正确的结果。 注意:不要改动main函数,不得增行或删行,也不得更改程序的结构. 试题程序: include <conio.h>...
【单选题】槐花中含有( )晶体。
A.
靛蓝晶体
B.
草酸钙簇晶
C.
硫酸钙晶体
D.
芸香苷晶体
【判断题】The width of every wave zone in the half wave zone method is half wavelength. ( )
A.
正确
B.
错误
【单选题】槐花中含有( )晶体。
A.
靛蓝晶体
B.
草酸钙簇晶
C.
硫酸钙晶体
D.
芸香苷晶体
E.
钟乳体
【判断题】The reflected wave has the half wave loss when the wave propagates from a wave denser medium to a wave sparser medium. ( )
A.
正确
B.
错误
【简答题】给定函数:① ② ③ ④ ⑤ ⑥ 在上述函数中为偶函数但不是奇函数的是
【多选题】活性石灰的生产方式有( )两种。
A.
竖窑
B.
平炉
C.
竖炉
D.
回转窑
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