【单选题】闽北现代民间版画以( )为主要创作形式,着力表现生活中的情趣与美感,以木版油印为主,吹塑版、粉印彩拓为辅。
【判断题】型腔铣的毛坯选择只能是实体,不能是平面。
【简答题】一卡诺热机在 600 K 和 300 K 的两个热源之间工作,则热机效率为 () ,若为卡诺制冷机,则制冷系数为 ()
【单选题】On average the months of greatest change of monsoon in Malacca Strait areas are .
A.
April SW to NE and October SW to NE
B.
April SW to NE and October NE to SW
C.
April NE to SW and October SW to NE
D.
April NE to SW and October EN to SW
【单选题】Reading skills Distinguishing between facts and opinions Look at the following statements from Text B and decide which are facts (F) and which are opinions (O). Perhaps the greatest change the world h...
【简答题】一卡诺热机在 600 K 和 300 K 的两个热源之间工作,则热机效率为 () ,若为卡诺制冷机,则制冷系数为 ()
【简答题】一理想卡诺致冷机在温度为 300 K 和 600 K 的两个热源之间工作。若把低温热源温度降低 100K,则其致冷系数将为原来的________倍。