下列哪一项是痢疾志贺菌的特性?()
A.可产生志贺毒素
B.只有1型
C.迟缓发酵乳糖
D.有15个型
E.培养中常出现扁平的粗糙型菌落
参考答案:A
金属材料的剖面线一般是与水平方向成45度的平行线,但在()时,可画成与水平方向成30度或45度的平行线。
The()program means a program written in a high-level language. It is generally translated to an()program, which is in a form directly understandably by the computer. The translation is usually done by a program called().
The translation is usually done by a program called()
A.compiler
B.assembler
C.compile
D.transfer