movement of the hands of a clock,frequency of vibration,flow of water in a pipe,分别是标量还是矢量?

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• movement of the hands of a clock,frequency of vibration,flow of water in a pipe,分别是标量还是矢量?
• movement of the hands of a clock,frequency of vibration,flow of water in a pipe,
• A m_____ hand of a clock is longer than a second hand.
• There are many roads in our home town _______(connect) to the cities around our country.我觉得用connecting，可答案却是connected，