材料受力时，其抵抗变形的能力叫（）。
A.刚度
B.硬度
C.屈服强度
参考答案：B
介导Ⅰ型超敏反应的新合成介质是()
A．PGD2
B．脂氧合酶
C．PAF
D．缓激肽
E．LTs
In spite of the song's popularity, the band ________ it from their new album as they failed to find one
who would sing it well enough. [ ]
A. deleted
B. concluded
C. kept
D. included
