【简答题】一包固体混合物可能含有碳酸钙、氯化钠、木炭粉、氧化铜和氧化铁中的一种或几种.现实验如下: 实验1、取少量试样,隔绝空气加热至高温,产生一种能使澄清石灰水变混浊的气体; 实验2、在冷却后的固体残留物上滴加稀盐酸,固体残留物部分溶解,生成一种在空气中燃烧时产生淡蓝色火焰的气体,未溶的固体呈红色. (1)则混合物中一定含有______; (2)写出一个上述实验过程中肯定发生的其中一个化学反应的化学方程式...
【单选题】有语句定义“char a[16];”,如果从键盘输入一个含空格的字串,可 用语句________。;
【单选题】听力原文:M: The food in this restaurant is horrible. If only we got to the school dining hall. W: But the food isn't everything. Isn't it nice just to get away from all the noise? Q: What can we learn fro...
A.
It's quiet in the restaurant.
B.
The restaurant is too far from their school.
C.
The price is high in the restaurant.
D.
The restaurant serves good food.
【单选题】若有定义语句:char s[16]="1234567\0\1";,则strlen(s)的值是( )。
【单选题】若有以下定义和语句,则输出结果是:char a[16]=”hello baby!”printf(“%d\n”,strlen(a));
【简答题】阅读理解。 It was a warm April day when a big fat envelope came in the mail from the only college I had ever imagined attending. I tore open the packet. My eyes were fixed on the word 'congratulations'. I ...
【单选题】张子龙(2010)认为,土壤中( )的含量是影响三七质量的关键营养元素。
【单选题】假设已有定义“unsigned char a=8;”,则执行语句“a=a<<2;”后,a的值是多少?