下列各种类型树脂中,()离子交换树脂的耐热性能最好。
A.强酸性
B.弱酸性
C.强碱性
D.弱碱性
参考答案:B
多发性硬化的主要临床特点是什么?
These data will be of considerable use for identifying and analyzing environmental degradation, and than crafting workable solutions.()
A. /
B. from
C. with
D. to