治安管理措施本身既有打击又有保护的双重作用。 ( )
参考答案：对
People planning trips home used to believe that only through the railway’s telephone ticket hotline ______ get their tickets efficiently.
A．they may
B．could they
C．shall they
D．they would
建立水效标识制度，推广节水技术和产品。加快非常规水资源利用，实施雨洪资源利用、再生水利用等工程。用水总量控制在（）立方米以内。
A.3500亿
B.5200亿
C.9000亿
D.6700亿
