同一种药物的不同晶型,制备得到的混悬剂稳定性是相同的。()
A. 对
B. 错
If you can make us a firm offer at a ______ price, we will place an order with yourcorporation.
A. competitive
B. comparative
C. subjective
D. objective
We should be pleased to send you some samples of our new typewriter on approval, ______ our own expense.
A. at
B. on
C. for
D. in
一般物质的荧光效率范围是( )
A. 0-0.1
B. 0- 0.5
C. 0-1
D. 0-2