单项选择题
A、24m B、30m C、40m D、52m
A、1层 B、2层 C、3层 D、4层
A、DK-KK-RCD B、DK-RCD-KK C、KK-RCD-DK D、RCD-KK-DK
A、I△＞30MA，T△=0.1S B、I△＞30MA，T△=0.1S C、I△＞300MA，T△=0.1S D、I△＞300MA，T△＞0.1S，I△·T△≯30MA·0.1S
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