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【简答题】
Task-based Reading. Louis Braille was born in Coupvray, France. He was a very small child. Unluckily, at the age of four, he became blind by accident. Louis began attending school in his town when he was seven years old. Three years later, Louis and his father traveled to Paris. There, he went to a school for blind children. One day a French soldier, Charles Barbier, visited the school. Barbier invented a system of night-reading. This system used small dots for the letters. Soldiers used this system in time of war. Barbier thought this system could help the blind to read. Soon Braille discovered that there were some shortcoming (缺点) in Barbier's system, but it gave Louis a brilliant idea. He improved Barbier's system. By the age of fifteen, his new system was completed! Now he wanted blind schools to try his system. Luck went against him again. The school refused to use his system. Louis died in 1852 in Paris at the age of forty-three. Two years after he died, the blind schools began to use his system. Today we call this system Braille in honour of Louis Braille. His system is used for all languages, and for maths, science, writing, music, and computers for the blind. Louis Braille Time Place Events in ________ (1) in Coupvray was born at the age of four / became ________(2) at the age of seven in ________ (3) started school at the age of ________ (79) at the age of ________ (4) studied in a school for blind children by the age of 15 / completed his new system in 1852 in Paris _________(5)
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【多选题】关于三极管放大电路的静态工作点,下面哪几个说法是正确的?
A.
三极管放大电路的静态工作点是由三极管自身的参数决定的。
B.
三极管放大电路静态工作点是由静态时的(u_BE, i_B) 和 (u_CE , i_C) 两个点组成的。
C.
三极管放大电路在工作中,实际工作点总是以静态工作点为中心左右摆动。
D.
三极管放大电路静态工作点的位置,影响这个电路的最大不失真输出电压。
【简答题】本题附图所示的开口容器内盛有油和水。油层高度 h 1 =0.7m 、密度 ρ 1 =800kg/m 3 ,水层高度 h 2 =0.6m 、密度 ρ 2 =1000kg/m 3 。 ( 1 )判断下列两关系是否成立,即 p A =p' A p B =p' B ( 2 )计算水在玻璃管内的高度 h 。 2、
【简答题】喷他佐辛成瘾性很小,不列入(__)药品,广泛用于各种(__)疼痛。
【简答题】本题附图所示的开口容器内盛有油和水。油层高度 h 1 =0.7m 、密度 ρ 1 =800kg/m 3 ,水层高度 h 2 =0.6m 、密度 ρ 2 =1000kg/m 3 。 ( 1 )判断下列两关系是否成立,即 p A =p ’ A p B =p ’ B ( 2 )计算水在玻璃管内的高度 h 。
【单选题】具有两个输入端A、B的二极管正“与”门电路,输入信号的高电平为6V,低电平为0V,当输入端A、B均为高电平时,下面几种说法正确的是()。
A.
因为Z=A²B,所以Vo=VA³VB=6³6=36V
B.
因为A=B=1、Z=A²B,所以VD=1³1V
C.
因为输入A、B皆为高电平6V,根据与逻辑关系“全高出高”,所以Vo≈6V
D.
因为A=B=1,所以Z=A²B=1³1=1
【单选题】sendmail默认用户邮件放在( ) 目录下。
A.
/var/mail/spool/
B.
/var/spool/mail
C.
/var/mail/
D.
~/mail/
【多选题】关于三极管放大电路的静态工作点,下面哪几个说法是正确的?
A.
三极管放大电路的静态工作点仅仅是由三极管自身的参数决定的。
B.
三极管放大电路静态工作点是由静态时的(u_BE, i_B) 和 (u_CE , i_C) 两个点组成的。
C.
三极管放大电路在工作中,实际工作点总是以静态工作点为中心左右摆动。
D.
三极管放大电路静态工作点的位置,影响这个电路的最大不失真输出电压
【多选题】对于减法运算电路,下面说法正确的是( )。
A.
是一个双端输入的运算放大器
B.
反馈电阻连接在输出端和反相输入端之间
C.
输出电压由两个输入端的电压信号的差值决定
D.
所有输入信号都要连接到反相输入端
【单选题】---____________the boy in a black coat ___________the UK ? ---No. He is ____________ U.S student .
A.
Is… from , a
B.
Does… come from , an
C.
Is… come from , an
D.
Is… from , an
【单选题】— Who's the boy _____ black pants? — He's _____ cousin. [     ]
A.
in, mine
B.
in, his
C.
on, my
D.
on, hers
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