吹塑模具冷却系统的主要作用是（）
A、冷却吹针
B、冷却切刀
C、冷却液压油
D、冷却制品
参考答案：D
Being a good listeners is kind of _____ and that's what it takes to keep friendship. [ ]
A. opinion
B. principle
C. shortcoming
D. quality
The chairman told the speaker that she ___ to speak a little louder so as to make herself _____. [ ]
A. was expected; heard
B. had expected; hear
C had hoped; hear
D. was hoped; heard
