【简答题】用久了的白炽灯灯泡内壁会变黑,其原因是钨丝先升华后______,与新买的同一规格的白炽灯灯丝相比,其电阻将______(选填“变大”、“变小”或“不变”).
【判断题】Receptive/passive vocabulary refers to words that one is able to recognize and comprehend in reading or listening but unable to use automatically in speaking or writing. ( )
【简答题】Passive vocabulary are those words that are recognizable in and .
【判断题】Passive vocabulary means the words one can use.
【简答题】How do you decide whether a word should enter the students’ active or passive vocabulary?
【判断题】垫块的作用主要是起到调节模具总厚度的作用。
【单选题】下列哪项不属于柱中箍筋的作用( )
B.
防止纵向钢筋受压时向外弯凸和混凝土保护层横向胀裂剥落