杆件在拉伸或压缩时,杆件仅有纵向变形。
参考答案:错
Rosa knows she is the eldest of the three children in the family, and she must work hard to _______ the other two. So she does.
A.set an example to
B.make the most of
C.take a look at
D.play a trick on
T淋巴细胞的功能不包括
A.免疫辅助功能 B.免疫抑制功能C.细胞因子分泌功能D.免疫记忆功能 E.吞噬功能