（）是突然发生的断裂，断裂前基本不发生塑性变形。
A.韧性断裂
B.穿晶断裂
C.脆性断裂
参考答案：C
. ---What are you doing here?
--- Oh, my teacher asked me to write a passage about ____ in English.
--- You can write ____ passage in English?
A．600 words; a 600 – words
B．600–word; a 600 words
C．600 words; a 600 – word
D．600 words; a 600 – words
不容易出现 * * 内包块的乳腺癌是
A．导管内癌
B．浸润性导管癌
C．小叶原位癌
D．浸润小叶癌
E．髓样癌
