第19题: [单项选择]Nouns, verbs and adjectives can be classified as A. functuional words. B. structural words. C. open class words. D. closed class words. 参考答案:C 答案解析:[解析] 名词、动词和形容词是典型的开放词类(open class words),指可以通过合成、派生、错词和造词等产生新词的词类。 [点睛] closed class words(封闭
第36题: [单项选择]已知某不可压缩流体管道,管径0.020m,上游流体压力980Pa,流量0.1m3/h,运动黏度1.01×10-6m2/s,密度1000kg/m3,管长100m,忽略管件局部阻力设备压力降。则管系下游压力和直管管阻是(
)组数据。 A. (972.9Pa,7.133Pa B. (266.7Pa,713.3Pa C. (26Pa,954Pa D. (1038.53Pa,58.53Pa 参考答案:B