画中间线时切忌只顾及了中间部位的准确,却忽略了线条的()和挺,或者光注意了线条的质量,而使中间位置产生了偏差。
A、长短
B、弯曲度
C、粗细
D、均匀
参考答案:D
Harry Potter only had a small room ____ when he just came to his aunt’s.
Choose the wrong answer :
A.to sleep
B.to sleep in
C.in which he could sleep
D.where he could sleep
在200g4.0%的氢氧化钠溶液中加入150 g盐酸时溶液pH=7.求:
(1)所得混合溶液中氯化钠的质量分数;
(2)若所用盐酸由36.5%(密度为1.2 g/cm3)的浓盐酸来配制,需要浓盐酸的体积是多少?