题目内容

金属的电化学腐蚀包括阴极反应和阳极反应两个过程。

A. 对
B. 错

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由于腐蚀介质中去极化剂的存在,使得单-金属不能够与腐蚀介质构成腐蚀电池。

A. 对
B. 错

Listen to the passage Why Do We Study English and tick the reasons for studying English mentioned by the speaker.[音频]

A. It is one of the most widely used languages in the world.
B. It is the language spoken by the largest population.
C. It is the only official language of the U.S.
D. It is one of the working languages at international meetings.
E. 80% of commercial emails are written in English.
F. It is the only official language used in the U.N.
G. Millions of books and magazines are written in English.
H. It is really a bridge to knowledge.
It enables us to visit foreign websites.
J. It helps us learn modern science.

阅读代码并填空:int[][] arr=new int[2][3];for(int i=0;i<2;i++){for(int j=0;j<3;j++){arr[i][j]=i+j;}}1)arr的元素个数是()2)下标1(行下标)的最大值是()3)下标2(列下标)的最大值是()4)arr[1][2]的值是()

葡萄糖顺浓度梯度跨膜转运依赖于细胞膜上的

A. 脂质分双分子
B. 紧密连接
C. 通道蛋白
D. 载体蛋白
E. 钠泵

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