修复test_mql事件后积分步长控制

tests/test_amesim_pnl0001_pipe.py

@@ -63,7 +63,8 @@ class AmesimPnl0001PipeTests(unittest.TestCase):
         self.assertAlmostEqual(derivative.m, 0.1)
         self.assertAlmostEqual(
             derivative.U,
-            0.2 * (internal.h + 1000.0) - 0.1 * internal.h,
+            0.2 * (internal.h + 1000.0) / self.pipe.gas.gamma
+            - 0.1 * internal.u,
         )