【单选题】充分条件假言命题有p(前件)、q(后件)两种事物情况,只有在p()q()的情况下,命题为假:
【单选题】It was between 1830 and 1835________the modern newspaper was born. [ ]
【单选题】It was between 1830 and 1835 ____ the modern newspaper was born.
【单选题】It was between 1830 and 1835 the modern newspaper was born.
【简答题】直流伺服电机主要由定子、 电刷与换向片组成。
【单选题】It was between 1830-1840 modern newspaper was born.