桥式起重机下放重物时，电动机产生的电磁转矩和重物力矩方向（），当电动机串入电阻越多时，重物下降速度越快。
参考答案：相反
下列有关气雾剂的叙述，正确的是
A．具有速效和定位作用
B．无局部用药的刺激性
C．吸入用气雾剂吸收完全
D．可避免药物首过消除和胃肠道的破坏
E．喷出物多为泡沫或细流
同义句转换。
1. She likes the book that was written by Lu Xun.
She likes the book__________ __________ Lu Xun.
2. She decided that she won't go alone.
She decided __________ _________ go alone.
3. Surfing the Internet can provide us with the latest news.
Surfing the Internet can ______ the latest news ______ us.
4. It took some students too much time to play computer games.
Some students ______ too much time ______ computer games.
5. People don't feel like doing simple jobs over and over again.
People __________ ____________ not to do simple jobs over and over again.
