被除数乘10，除数______，商不变．
被除数乘10，除数乘10，商才能不变；
故答案为：乘10．
— Sorry to have disturbed you.
— ________. You didn't mean to, did you? [ ]
A. Up to you.
B. Forget it.
C. All right.
D. You'd better not.
砷斑法测定砷的原理中，最后进行比色定量时，生成的化合物的颜色是（）。
A.蓝色
B.红色
C.绿色
D.橙色
E.黑色
