标注垫片的厚度尺寸时,尺寸数字前加注符号为()。
A.φ
B.σ
C.γ
D.μ
参考答案:B
Give your friends or family members a phone call and tell them your return time, or you will lose the chance of being found in case you get lost in the woods.
县以上人民政府应当建立(),对染疫动物和疑似动物及其产品、病死或者死因不明的动物尸体等进行无害化处理。