我国国家标准中规定亚硝酸钠的最大使用量为()
A.0.05mg/kg
B.0.10mg/kg
C.0.15mg/kg
D.0.20mg/kg
E.0.50mg/kg
参考答案:C
a×b=0则a和b至少有一个数为0.______.
At first ___ , the bag seems made of real leather, but actually it is just an imitation.
A.sight
B.look
C.appearance
D.view