如果安装新皮带，应在发动机以标定转速运转（）分钟后再次检查皮带张紧力。
A.30
B.45
C.60
D.80
参考答案：A
根据句意及汉语提示用适当的词或短语填空。
2. She could just _____ (想像) how Jessica felt.
3. I _____ (像) my father in looks.
4. He has _____ (推迟) his visit until next month.
5. John had a room _____ (类似的) to this one.
退休
