【单选题】水在单位时间内穿透( )的能力称为渗透系数。
【简答题】When mixing two insulins together, the _______ insulin is always drawn up first!
【单选题】When mixing alginate impression material( )
A.
add water to the powder
B.
add water to the powder
C.
add the powder to the water
D.
add them together at the same time
【判断题】堆码时货垛的“五距”是指 垛距 、 墙距 、柱距 、顶距 、 灯距
【单选题】牛车的两轮与轴固定,轴与轮架之间的润滑一般是使用( )。
【单选题】When mixing electrolyte for a lead-acid storage battery, ________.
A.
stirring should always be avoided
B.
. a lead container should always be used
C.
always pour the water into the acid
D.
always pour the acid into the water