在行星齿系中，如果有锁止元件，当行星架为输入元件时，其输出（）。
参考答案：必定形成升速档
The school finally listened to the students’repeated request that they_______a seven-day holiday on National Day
A．would spend
B．spent
C．spend
D．were going to spend
尾蚴性皮炎
