【Daily Question】Hydropower Engineering - 20200217
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Multiple choice: The grade standards for dikes are determined by their designed flood (tidal) protection criteria. Which of the following statements about dikes is correct? ( ). A、Level 1: Occurs once every 100 years or more B、Level 2: Occurs once every 50–100 years C、Level 3: Occurs once every 30–50 years D、Level 4: Occurs once every 20–30 years E、Level 5: Occurs once every 10–20 years Answer: ABCDE
A、Level 1: Occurs once every 100 years or more B、Level 2: Occurs once every 50–100 years C、Level 3: Occurs once every 30–50 years D、Level 4: Occurs once every 20–30 years E、Level 5: Occurs once every 10–20 years