多项选择题

以下属于森林的生态效益的是（）。

A．涵养水源
B．防风固沙
C．降低噪音
D．净化空气

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多项选择题

What opportunities can the "Belt and Road" initiative bring to the tourism industry?

A．It will provide better transportation system for tourism
B．The belt and road region has abundant tourism resources
C．There is policy advantage regarding to tourism
D．The "Belt and Road"has nothing with the tourism industry
E．The "Belt and Road" is just the China's new policy

单项选择题

力学系统中工程制单位制度中的基本量纲有几个？单选
A、6
B、5
C、4
D、3