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【判断题】
用汞电极在不同无机盐溶液中测得的电曲线的最高点的位置与溶液的成分和种类无关。A.
正确
B.
错误
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【简答题】Life in the 21 st century is different from that in the 20 th century because there are many changes in the new century.What will our life be like in 20 years?Maybe we will have robots at home. Here i...
【简答题】Life in the 22 nd century will be different from that in the 21 st century because many changes will happen in the new century. 1_____ what will the changes be? First, the population is growing very f...
【简答题】完形填空。 We are now living in the 21st century. Is your classroom living in the 21st centuiy, too? Tony is a student in Grade 8 at an American middle school. He was surprised when he saw his modern 1 on ...
【简答题】请听写出下列正确化学用语符号。
【简答题】请听写出下列正确化学用语符号。
【单选题】若∫f(x)dx=x 3 e 2x +C,则f(x)=( )．
A.
6x 2 e x
B.
3x 2 e 2x
C.
2x 3 e x
D.
x 2 e 2x (3+2x)
【单选题】设函数 f ( x )＝ x 3 －4 x ＋ a ，0＜ a ＜2．若 f ( x )的三个零点为 x 1 ， x 2 ， x 3 ，且 x 1 ＜ x 2 ＜ x 3 ，则
A.
x 1 ＞－1
B.
x 2 ＜0
C.
x 2 ＞0
D.
x 3 ＞2
【简答题】A．In the 19th century. B．In 1973. C．In 1998. D．In the 21st century.
【多选题】梁的横截面上正应力的分布规律包括:
A.
上、下边缘的点应力最大
B.
中性轴上为零
C.
正应力的大小与到中性轴的距离成正比
D.
正应力的分布规律与各点的变形规律不一样
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