【判断题】卷材面层根据材质可分为:塑料地面、橡胶地面、地毯、木质地面。
【单选题】测试文件时标定义语句的正确写法是( )。
【单选题】时标定义语句`timescale ( )中,下面哪种是不合法的:
【单选题】The function of a hydropower station is to .
A.
Convert potential energy into electric energy;
B.
Convert electric energy into potential energy ;
C.
Convert water energy into electric energy.