【单选题】某种易溶性化学物质因偶尔事故排入河道,在排入点下游15km处有一城市供水厂取水口,已知河流平均流速为每小时3km。预计()
A.
发生影响最为显著的时段,只能采用水质数学模型来确定
B.
不须经过 5h 就己经对城市供水厂取水口产生影响
C.
C. 经过 5h 后将会消除对城市供水厂取水口产生的影响
D.
D. 至少 5h 才会对城市供水厂取水口产生影响
【单选题】S-246. A nurse is caring for a postpartum who is being discharged with her newborn. Which discharge instruction should the nurse teach the regarding newborn safety?
A.
Avoid using blanket rolls to position the infant in the car seat
B.
Place the baby in bed in the prone position while sleeping
C.
Place the infant's car seat in the back seat facing forward
D.
Use an infant sleep sack when the newborn is in the crib
【单选题】某种易溶性化学物质因偶尔事故排入河道,在排入点下游15km处有一城市供水厂取水口,已知河流平均流速为每小时3km。预计()
A.
不须经过 5h 就己经对城市供水厂取水口产生影响
C.
经过 5h 后将会消除对城市供水厂取水口产生的影响
D.
发生影响最为显著的时段,只能采用水质数学模型来确定
【多选题】以下关于配合的描述正确的有()
C.
相互配合的孔、轴定心精度要求高时,不宜采用间隙配合
F.
配合过盈量大的部件装配时可采用热套法和冷轴法
【判断题】传递扭矩的孔和轴的配合一般选用过渡配合。
【单选题】________, I don't object to your marriage though your parents are strongly against it. [ ]
B.
As far as I am concerned