在锅炉给水系统中发生的腐蚀都属于电化学腐蚀。()
参考答案:对
I am told that the new law will come into ________ on January 1st next year.
A.effect
B.use
C.service
D.existence
鼠的毛色类型由遗传因子B、b控制,甲、乙黑毛雌鼠分别与褐毛雄鼠丙交配,甲3胎共生出9只黑毛幼鼠和7只褐毛幼鼠,乙3胎共生出19只黑毛幼鼠,则甲、乙、丙3只鼠的遗传因子依次可能为()
A.BB、Bb、bb
B.bb、Bb、BB
C.Bb、BB、bb
D.Bb、bb、BB