Android四大组件是（），（），（）和（）。

读短文，判断正(T)误(F)。

      I have a new English teacher. Her name is Mary Black. She's from Canada. She is young and pretty. Her

eyes are blue and her hair is yellow. She is active. She likes singing and dancing. She tells us stories (故事) and

teaches (教) us English songs. Her class is so much fun. She is strict, but she is very kind. We all like her.

( ) 1. We can call our new English teacher Miss Mary.

( ) 2. My English teacher is quiet.

( ) 3. My English teacher likes singing.

( ) 4. My English teacher is a Chinese lady.

( ) 5. Mary Black can tell stories.

1个硫原子的质量为ag，1个，¹²C原子的质量是b g，若N_A只表示阿伏加德罗常数的数值，则下列说法中正确的是[     ]

①硫原子的相对原子质量为

②m g硫原子的物质的量为mol

③硫原子的摩尔质量为aN_A g

④ag硫原子所含的电子数为16 mol

A.①②

B.②④

C.①③

D.②③

接触器闭合后产生较大的嗡嗡声，其原因是（）。

A.线圈接线不实

B.固定螺丝松动

C.电压低

D.短路环断

C语言库函数fgets(str,n,fp)功能是______。

A．从中指向的文件中读取长度n的字符串存入int指向的内存

B．从fp指向的文件中读取长度不超过n-1的字符串存入str指向的内存

C．从fp指向的文件中读到n个字符串存入str指向的内存

D．从str读取至多n个字符到文件fp

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