【简答题】半合成青霉素的特点不包括() A耐酸 B耐酶 C广谱 D抗铜绿假单胞菌 E对G-菌无效
【单选题】From Paragraph 4, we know that ______.
A.
the electronic bulletin boards are a popular source of computer viruses
B.
most viruses come from software sellers
C.
whatever measures are taken, it is impossible for people to protect their system against computer viruses
D.
some viruses are data-destroying ones
【简答题】阅读理解 There is a growing problem of what to do with electronic waste such as old televisions, computers, radios, cellular telephones and other electronic equipment. Electronic trash, or e-waste, is pil...
【简答题】我们学院的IP地址是( ),属于( )类IP地址
【简答题】设 是可测集,定义在E×(0,1)上的f(x,y)满足:f(x,y)是E上(y固定)的可测函数,又是(0,1)上(x∈E固定)的连续函数,试证明: , 均在E上可测.
【简答题】半合成青霉素的特点有()、()、()、()等,头孢菌素类特点有()、()、()、()、()、()等,它们都属于( )类药物,虽然临床应用较好,但与青霉素()交叉过敏反应。