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一、 单项选择。 ( ) 1. —I read ________ story about Shennong ? Do you know who he was , Tony? —He was ________ emperor in ancient China. A. a ; / B . a ; an C . an ; a ( ) 2. —Your sister looks very ________.What's the matter with her? —She has a stomachache. A. funny B . weak C . boring ( ) 3. —Does that sweater ________ her? —Sure.She is really beautiful in it. A . hit B . keep C . fit ( ) 4. —Li Mei's ________ is very beautiful. —Yes.Her songs ________ very beautiful. A. noise ; voice B . voice ; sound C . sound ; noise ( ) 5. If Jerry forgets to take an umbrella , please ________ him. A. explain B . r emind C . remember ( ) 6. All the people there can't speak English , so ________ can understand him. A . somebody B . Something C . nobody ( ) 7. —Do you know Peter? —Yes , he ________ Susan last year and now they had a baby. A. married B . Smiled C . continued ( ) 8. —Mom , I want to drive to my grandparents' home. —Don't be ________.You are too young to drive. A. silly B . noisy C . nervous ( ) 9. —When will you visit your friend , Zhu Mei? —________ she returns to the city. A. So that B . As soon as C . Unless ( ) 1 0. —How did you make your dream come true? —I just kept ________ and never gave up. A. try B . tried C . trying
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参考答案:
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【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】读下列某地区岩石与1月均温等值线分布图,回答问题。 1.图示地区的地质构造属于___________,判断依据是_____________________;地形属于_________,判断依据是_____________________。 2.在甲、乙、丙三处中最有可能发现动植物化石的是处________,如果发现的是三叶虫化石,则可判定该处地层形成于_________代。甲处岩石最可能是变质岩中...
【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>...
【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
【单选题】以下关于函数的说法错误的是:()
A.
系统函数只能是系统给定的,在程序中不能添加
B.
程序中的自定义函数只在程序中有效
C.
自定义函数能在整个站点共享使用
D.
以上答案都正确
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