以下哪个选项可以查询车道入口流水是否积压?( )
(A)select count(*) from enpass_trans;
(B)select count(*) from enpass;
(C)select count(*) from expass_trans;
参考答案
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(A)select count(*) from enpass_trans;
(B)select count(*) from enpass;
(C)select count(*) from expass_trans;