【单选题】是指一种劳动力的工资率变化百分比所引起的另一类劳动力需求量变化的百分比。
【简答题】I thought 'some good.______ .(advice) to help the poor.
【单选题】需求价格弹性是指()变动百分率和()变动百分率的比值。
【单选题】Summer is _______ good time for swimming, so you can find a good coach to help you in _______ summer of 2010.
【多选题】为了有效的防止抹灰层的空鼓与开裂,在监督控制中应加强检查()
【单选题】Good _________ habits help me get good grades.