A model was developed to simulate the river with _______ bed and banks composed of sandy materials.

花坛的功能包括哪些方面？A．组织交通 B．分隔和屏障 C．美化环境 D．标志和宣传

多项选择题 花坛的功能包括哪些方面？

An economic system in which business are allowed to pro...

单项选择题An economic system in which business are allowed to produce any goods and services they wish to is referred to as ... A.
A centrally planned economy B.
market economy C.
A mixed economy D.
A private economy

借贷记账法下，账户的贷方登记( )。A、资产增加B、资产减少C、负债增加D、所有者权益减少

多项选择题借贷记账法下，账户的贷方登记( )。