在电路中,半导体材料的符号为()。
A.
B.
C.
D.
参考答案:D
---You are so busy nowadays. I wonder what you’re up to.
---Oh. I’m writing a novel _______ next month by Chinese Writers Publishing.
A.published
B.being published
C.to be published
D.to publish
腐蚀疲劳是指金属在腐蚀介质和()作用下产生的腐蚀。
A.径向应力
B.轴向应力
C.可变应力
D.不可变应力