main sequence
3.The Galactic distribution shows that most of them belong to extreme population I, and indicates the objects listed in this catalogue could mostly be stars of intermediate and high mass either in the pre- or post-main-sequence stage.
4.We discussed some physical properties of NGC 2244 based on our membership probabilities and 2MASS data, such as the radius of the cluster, pre-main sequence stars, and apparent Ks-band luminosity function.
5.Table 5 presents the starspot parameters, including the latitudss, longitudes, radii and temperatures as well as their errors. Table 6 are the Roche model parameters in which the new photometric mass ratio q (=m2/m1) is 0.454±0.005. The photometric results show that WY Cnc is a Main Sequence detached system.
9.The main task of PLC realizing sequence control is to developa program for the users. This article takes a series of Japanese small-sized Programming Control of Mitsubishi as examples, and three basic programming methods — basic logical instructions, shifting register and step ladder are discussed.

