填料的所有几何表面积都参与了空气干燥或SO3吸收过程。
参考答案:错
在平面直角坐标系中,将点A向右平移2个单位长度后得到点A′(3,2),则点A的坐标是
A.(3,4)
B.(3,0)
C.(1,2)
D.(5,2)
Without proper lessons, you could ___ a lot of bad habits when playing the piano.
A.keep up
B.pick up
C.make up
D.catch up