碳水化合物的消化代谢方式有两种，反刍动物是以葡萄糖代谢为主。
A、正确
B、错误

单项选择题When we show a cash flow, if it is not specifically specified, we A、can't determine the time point of cash flow B、assume artificially the time point of cash flow C、assume this cash flow is received at the end of the period D、assume this cash flow is received at the beginning of the period

单项选择题当墙后填土处于朗肯主动破坏状态时，滑动面与水平面的夹角为45°-φ 2。 A、正确 B、错误