4÷0.16=______÷16=______.
4÷0.16,
=(4×100)÷(0.16×100),
=400÷16,
=25;
故答案为:400,25.
阻值都为10Ω的两个电阻并联后,其等效电阻为( )
A.5
B.10
C.20
D.40
危害鲤、鲫鱼的鲤蠢绦虫的中间寄主是()
A.鳔水蚤
B.剑水蚤
C.锚头蚤
D.颤蚓