计算题:求f(t)=e-atsinωt的拉氏变换。
参考答案:
因为,由S域位移性质得到
— How was your job interview?
— Oh, I couldn't feel ________. I hardly answered most of the questions they asked. [ ]
A. better
B. easier
C. happier
D. worse
肠杆菌科的共同特性是()
A.不发酵葡萄糖,氧化酶阴性,不还原硝酸盐
B.发酵葡萄糖,氧化酶阳性,还原硝酸盐
C.发酵葡萄糖,氧化酶阴性,不还原硝酸盐
D.不发酵葡萄糖,氧化酶阴性,还原硝酸盐
E.发酵葡萄糖,氧化酶阴性,还原硝酸盐