【单选题】There are many _____ people in the world, they can’t see anything, but they never give up their dreams.
【判断题】在零件图上标注尺寸时,有时可以出现封闭的尺寸标注。()
【判断题】标识为200HBS的材料硬度大于标识为50HRC的材料硬度。
【多选题】夹具装配总图上 需要 标注 的 尺寸有 。
【单选题】According to the passage, why is the binary system often called 'the lazy schoolboy's dream' ?
A.
Arithmetic operation in this system are relatively easy.
B.
The two-scale mathematical operations are interesting.
C.
The schoolboy likes the digital computers.
D.
This system is not required to be learned in school.
【单选题】下列程序执行后的输出结果是 void funcl(int i); void func2(int i); char st[]='hello,friend!'; void funcl(int i) {printf('%c',st[i]); if(i<3){i+=2;func2(i);}} void func2(int i) { printf('%c',st[i]); if(i<3){i+=2;func...
【判断题】标识为100HBS的材料硬度大于标识为60HRC的材料硬度。