题目内容
改变管道内气柱固有频率主要可以通过改变缓冲器容积或管道直径与长度。
查看答案
搜索结果不匹配？点我反馈
更多问题
行政行为的内容有哪些？
国产6号液力传动油用于（）的液力变矩器。
中国大陆科幻作者中获得银河奖首奖最多的一位作者是谁？
The following triggers were defined for table TAB1 in the order shown:CREATE TRIGGER trig_a AFTER UPDATE ON tab1 FOR EACH ROW UPDATE sale_tab SET sale_date = CURRENT DATE; CREATE TRIGGER trig_b AFTER UPDATE ON tab1 FOR EACH STATEMENT UPDATE invoice_tab SET invoice_date = CURRENT DATE; CREATE TRIGGER trig_c AFTER UPDATE ON tab1 FOR EACH ROW UPDATE shipping_tab SET ship_date = CURRENT DATE; CREATE TRIGGER trig_d AFTER UPDATE ON tab1 FOR EACH STATEMENT UPDATE billing_tab SETbilling_date = CURRENT DATE;If an event occurs that causes all of them to activate, which trigger will be activated first?（）
微信支付 
支付宝支付