【单选题】电子计算机与其它计算工具的本质区别是____。
【单选题】_______ I admit the problem is very serious, I don't think it can't be solved.
【单选题】My problem is very to yours.
【简答题】电子计算机与其它计算工具的本质区别是().A. A:能进行算术运算 B. B:运算速度快 C. C:计算精度高 D. D:存储并自动执行程序
【简答题】A.Not at all. B.It's my pleasure. C.No problem. D.Thank you very much.
【单选题】(1)两列波的波程差为波长的整数倍时,干涉相长;(2)两列波的相位差为π的偶数倍时,干涉相长。
【单选题】I can't find my pyjamas! They are ______________. [ ]