【判断题】DF4B内燃机车基础制动装置由制动缸、杠杆系统和制动闸瓦等组成。 ( )
【单选题】最可靠,能杀死芽孢,最广泛使用的灭菌方法是
【简答题】What are the side-effects of amphetamines?
【多选题】About Side effects :
A.
It is often slight, recoverable functional alteration of the body.
B.
The pharmacological basis of side effect is lower selectivity
C.
Side effects vary with different therapeutic goals.
D.
Side effects are not predictable
【单选题】某一点的绝对大气压为100Kpa,已知当地大气压为一个工程大气压,其相对压强为( )。
【单选题】国际直接投资与国际间接投资最主要、最根本的区别是( )。