【简答题】规范的实验操作是实验成功的前提,请回答: (1)将试管套入试管夹时,应从试管______套入(选填“底”、“口”). (2)胶头滴管用过后应______,再去吸取其他药品. (3)玻璃管插入带孔橡皮塞,先把玻璃管的一端______,然后稍稍用力转动,使它插入.
【单选题】检验烧结矿的以下指标中,属于检验烧结矿的物理性能指标的是( )。
【判断题】The broadcast seeds laid on top of the ground have a much lower germination rate than those with a covering.
【简答题】化学实验基本操作在化学学习和研究中具有重要作用.请用下图常用化学仪器的字母序号为下列实验操作各选一种回答问题: (1)用于作热源的仪器是______. (2)可直接在酒精灯火焰上加热的玻璃仪器是______. (3)吸取和滴加少量液体时用______. (4)量取一定量液体时用______. (5)用于贮存固体药品的仪器是______. (6)用于夹持燃烧镁条的工具是______. (7)可用于加...
【单选题】I suppose if you _____ the soil with chemical fertilizer these differences would be less ________, but I use it sparingly and only in rows right where seeds are planted rather than broadcast over the ...
【简答题】I like watching TV when I get home __1__ weekends. I t urn on the TV set, hold the remote ____2____ , switch from channel to channel for favorite ____3___ , and it is really relaxing to watch TV on th...