在国家三级保护野生药材物种范围内的药材是() ["A.虎骨","B.甘草","C.人参","D.黄柏","E.黄芩"]
阻力点位于力点和支点之间的杠杆模式() ["平衡杠杆","省力杠杆","无力杠杆","速度杠杆","减速杠杆"]
测定岩体中的初始地应力时,最常采用的方法是:() ["应力恢复法","应力解除法","弹性波法","模拟试验"]
支点在力点与阻力点中间的杠杆模式() ["平衡杠杆","省力杠杆","无力杠杆","速度杠杆","减速杠杆"]
用紫外线灯为某病室进行空气消毒时,该病室湿度为70%,为保证良好的消毒效果,下列做法正确的是() ["更换紫外线灯管","延长消毒时间","缩短消毒时间","降低室内温度","增高室内温度"]
怎样从海洋里采集海水水样?