胶布裁断要根据()计算确定
A.胶管内径、胶管厚、夹布层数
B.胶管内径、胶管厚、胶布厚、夹布层数
C.胶管厚、胶布厚、夹布层数
D.胶管内径和夹布层数
参考答案:B
My best friend Alex failed in the math competition. I'd like to _________. [ ]
A. dress him up
B. pick him up
C. cheer him up
D. make him up
限量元素砷的测定方法有()
A、银盐法
B、砷斑法
C、示波极谱法
D、氢化物原子吸收(荧光)法
E、石墨炉原子吸收分光光度法