A:①比②的放大倍数大,③比④放大倍数小
B:把视野里的标本从图中的乙换为丙时,应选用③,同时提升镜筒
C:从图中的乙转为丙,视野变暗可转动细准焦螺旋进行调节
D:若使物像放大倍数最大,甲图中的组合一般是②③⑤
张老师上课时做了趣味实验:他选择了一种指示剂(无色酚酞试液或紫色石蕊试液)、稀盐酸、稀NaOH溶液。他先用玻璃棒蘸取某种指示剂在白纸上写上“化学”,可是学生什么也看不见。然后用某种物质喷洒在白纸上,出现了红色的“化学”二字。接着,又向纸上喷洒另一种物质,红字消失。则他选用的指示剂是____,先喷洒的物质是____,后喷洒的物质为____。如果选用另一种指示剂情况会____.
说到人生追求,我们也许会吟诵,“路漫漫其修远兮,吾将上下而求索”, “蜀道之难,难于上青天”,“独上高楼,望尽天涯路”,这里依次引用的文学形式分别是( )
填入下面一段文字横线处的语句,最恰当的一句是( )
发展家庭农场,______________________。很多家庭农场由于面积太大,人力、管理跟不上,导致土地产出率下降。因此,各地必须综合考虑发展水平、农村劳动力转移程度、农地资源禀赋等因素,选择合适的规模,切不可贪大求全、盲目扩张。
they, take, cry, go, sleep
After finishing all the food in the little bowl,Goldilocks wanted to rest.She chose the small chair,but it was in pieces.Then she walked into the bedroom and very soon fell____in the small bed.The Bears returned to____house.Baby Bear pointed at Goldilocks and____,"That's the bad girl.She ate my food and broke my chair!"Hearing this.Goldilocks jumped up and hurried out of the house without____her basket.She decided not____for a walk in the forest again.