高压断路器()带负荷操作。
A、不能
B、有时不能
C、可以
参考答案:C
In addition to the usual parameters that describe a normal distribution, to completely describe 10 random variables, a multivariate normal distribution requires knowing the:()
A. 45 correlations.
B. overall correlation.
C. 10 correlations.
三相异步电动机采用自耦降压起动的方法不适应于()起动。
A、空载
B、轻载
C、重载
D、加速