【单选题】当住宅楼梯底层平台下设置通道时,平台下的净高应不小于( )。
【单选题】In Wenchuan earthquake, ______ people have died. [ ]
【简答题】他死了两年了. He for . He since . It two years since he died./It two years since he died. Two years (过去了) since he died.
【简答题】NTC 温度传感器器 温度越高,阻值越( ),温度越低,阻值越( )。注选填大或小
【单选题】琼脂在固体培养基中的用量一般为( ) g/L 。
【单选题】There was a malaria _______________________ in the village, and many people died.