【简答题】宋代开始清明节与________合二为一
【单选题】Energy industry is the totality of all of the industries involved in the production and sale of energy, including fuel extraction, manufacturing, ( ) and distribution.
【多选题】下列说法中,正确的是( )。
E.
孤立体系在平衡态时的熵变等于零,且达到最小值
【简答题】Read the following writing topic, and answer question that what writing genre it is? ●The production and sale of cigarettes should be made illegal.
【简答题】哈地铁广播系统由控制中心、()、车辆段、停车场广播子系统组成。
【单选题】由光纤数字传输系统、数字电话交换系统、闭路电视监控系统、无线通信系统以及车站广播系统等组成的系统是( )
【多选题】下列说法中,不正确的是:
B.
任何条件下,化学反应的热效应只与反应的始态和终态有关,与反应的途径无关;
C.
纯物质的规定熵是一个相对值,其绝对值无法知道;
D.
物质的焓的绝对值无法知道,纯物质的规定熵的绝对值也无法知道。
【单选题】The incremental profit earned from the production and sale of a new product will be higher if:
A.
the costs of materials needed to produce the new product increase.
B.
excess capacity can be used to produce the new product.
C.
existing facilities used to produce the new product must be modified.
D.
the revenues earned from existing products decrease.