离子束分析方法的优缺点?
参考答案:
优点:灵敏度高、分析时间短、不破坏样品、分析范围广和取样量少等优点,因此特别适用于痕量元素的分析;缺点:设备复杂、成本较高。
California seems to be the home of the homeless since many are often observed tramping along railroad tracks and through the downtown areas of the cities.
A.roaming
B.trimming
C.stealing
D.stamping
对面向对象来说,按照集成的粒度不同,可把集成测试分为()。