中倍数泡沫灭火系统采用罐囊式压力比例混合装置时,水进口压力范围为()MPa。
A、0.3~0.6
B、0.4~0.8
C、0.5~1.0
D、0.6~1.2
参考答案:C
Which of the following is NOT an assumption behind efficient capital markets()
A. New information occurs randomly, and the timing of announcements is independent of one another.
B. Market participants correctly adjust prices to reflect new information.
C. Return expectations implicitly include risk.
有关外毒素的错误描述是( )
A.主要由革兰阳性菌产生
B.也可由革兰阴性菌产生
C.具有特异的组织亲和性
D.其成分为脂多糖
E.可经甲醛脱毒成类毒素