硬质合金是由()、碳化钛粉末,用钴作黏结剂,经高压成型、高温煅烧而成。
A.碳化钨
B.碳化物
C.氮化钨
D.碳化铌
参考答案:A
— Let's make some popcorn.
— _____ . [ ]
A. It's scary.
B. We have some
C. Thank you
D. It's a good idea.
0的倒数还是0______.(判断对错)