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They represent an exceptional document of the activity of considerable personalities , master photographers as well as scholars , active from the second half of the 19th century ( Parker collection ) , to the beginning of the 20th century ( Moscioni , Van Deman and Askew collections ) , and more recently ( Masson and Bini collections ) . Children shall wear sun-protective clothing , such as hats , long-sleeved shirts and pants , when playing outdoors between the hours of 10 AM and 2 PM . The front rider steers the bike , tells you about turns and changes in speed , and warns of changes in the terrain ( such as hills , bumpy roads , and puddles ) while both of you pedal . Less sensitive questions , such as demographics , occupational status , household size , and composition , were asked aloud by the interviewer and recorded in the questionnaire booklet . Off-the-shelf purchases of foreign military technology such as SU-27s , Kilo-class submarines , and other military equipment from Russia that could speed up China 's military development have attracted notice from China 's neighbors ; however , the time required to learn new technologies and integrate them into China 's existing force structure and to make them operational suggests that any increase in China 's military capacity will be incremental rather than dramatic .