在检查储粮害虫时，应采取定点与易发生害虫部位相合的办法设置取样点，所取各点样品应分别单独检查害虫密度。
参考答案：对
A．粒子加速次数越多，粒子获得的最大动能一定越大
B．若增大磁感应强度，为保证该粒子每次进人电场均被加速，应增大高频电源交流电的频率
C．不同粒子在两D型盒中运动时间可能不相同
D．不同粒子获得的最大动能都相同
If you saw flames aboard a vessel but could see the vessel was not on fire，you would know that the（）.
A.crew was trying to get warm
B.vessel required immediate assistance
C.vessel was attempting to attract the attention of a pilot boat
D.vessel was being illuminated for identification by aircraft
