离心泵扬程随流量而变化在一定（）下只能供给一定的扬程。
参考答案：流量
He whispered to his wife _______ he might wake up the sleeping baby.
A．so that
B．on condition that
C．for fear that
D．so long as
用于太阳经头痛的药物是
A．羌活B．葛根C．细辛D．柴胡E．吴茱萸
