【多选题】黑板报、小广播等传统媒体的宣传要求包括()。
【判断题】锉削时两手用力要平衡,回程时不要施加压力,以减少锉齿的磨损。
【单选题】It looked like rain. __________, it is clear this morning.
【单选题】They had the party outside ______ it looked like rain.
【单选题】《诗》到了( )代被统治者奉为经典,称为《诗经》。
【简答题】It looked like rain. The 1 was gray. It was almost noon, but the sun was hidden by a gray blanket. It was cool. There were no birds 2 anywhere. A 3 of birds sat on the telephone wire. Bob was standing...
【多选题】关于转向器传动效率,下列选项中正确的有
A.
转向器的输出功率和输入功率之比称为转向器的传动效率
B.
转向器的输入功率和输出功率之比称为转向器的传动效率
C.
由转向轴输入、由转向摇臂输出情况下求得的传动效率为正效率
D.
由转向轴输入、由转向摇臂输出情况下求得的传动效率为逆效率