Câu 4: Phương trình chuyển động của một chất điểm trong hệ tọa độ Oxy là x =2t (cm); y= 3t2 (cm). Khoảng cách từ chất điểm đến gốc toạ độ tại thời điểm t = 2s là:
A. 12, 65 cm. B.40cm. C. 52 cm. D. 7, 21 cm

Which statements about wells are true? check all that apply. a) wells bring groundwater from the unsaturated zone to the surface of the water. b) wells need to be drilled below the water table. c) if water is pumped from a well too quicky, the well may run dry. d) water from wells is generally not safe to drink. e) water gushes from artesian wells due to pressure.

Where is the vascular system located

Which statements describe characteristics of mdcs? higher standard of living increased agricultural focus more access to health care more access to transportation and communication more industry reduced educational opportunities shorter life expectancy