工程中经常遇到这样的情况，同等市电电压条件下，UPS设备轻载启动较重载启动容易。究其主要原因是重载启动与轻载启动设备启动门限电压不同。
参考答案：错
合并同类项：x2y3-5x2y3=______．
---I think we should save the endangered animals.
---I agree ______ you. There aren’t many of them.[ ]
A. so
B. with
C. that
D. about
