断裂延伸率可以通过直测试件断裂前的长度变化求得。( )
参考答案:错
Lucy is a girl of great musical _________, and I’m sure she will become a well-known musician sooner or later.
A.ability
B.sense
C.value
D.potential
如图是家蚕的发育示意图,据图判断回答问题:
(1)家蚕的成虫是______和______,幼虫是______(填字母代号)
(2)家蚕的发育属于______发育,将上述各图按家蚕的生殖发育过程进行排序,______(填字母代号)