【单选题】20f6、20f7、20f8三个公差带( )
【单选题】In this section you will hear ONE interview. The interview will be divided into TWO parts. At the end of each part, five questions will be asked about what was said. Both the interview and the questio...
A.
A . Because some of them are not used to some kinds of alcohol.
B.
Because most of them drink fewer times than people of other continents.
C.
Because half of them lack a gene to break down alcohol efficiently.
D.
Because some of them suffer from diseases that limit drinking.
【单选题】20f6、20f7、20f8三个公差带( )。
A.
上偏差不相同且下偏差相同 上偏差不相同且下偏差相同 上偏差不相同且下偏差相同
【单选题】20f6、20f7、20f8三个尺寸的公差带
【判断题】财政收入的集中汇缴是指由征收机关按有关法律法规规定,将所收的应缴收入汇总缴入国库单一账户或预算外资金财政专户。( )
【单选题】用草酸钠作基准物标定高锰酸钾标准溶液时,开始反应速度慢,稍后,反应速度明显加快,这是( )起催化作用。
【单选题】电路如图所示,两个稳压二极管DZ1和DZ2,稳压值分别为7V和9V,正向导通压降都为0.7V, 由这两个稳压管串联输出的稳压值为()。