样带的研究中，不属于研究样点功能的是（）。
A.反映环境变化及其影响
B.定期调查
C.遥感解译
D.技术支持
参考答案：D
要为当前表中所有职工增加100元工资应该使用命令（）。
A、Change工资with工资+100
B、Replace工资with工资+100
C、Changeall工资with工资+100
D、Replaceall工资with工资+100
Deck foam systems，designed to protect cargo areas on tankers built after January 1，1975，must have a supply of foam-producing material to operate the system at its designed rate of foam production for（）.
A.15 minutes without recharging
B.20 minutes without recharging
C.25 minutes without recharging
D.30 minutes without recharging
