【单选题】6个月婴儿,母乳喂养,每日大便5~ 6次,为黄色稀糊便,但生长发育完全正常,此时应该如何指导家长进行合理喂养
【简答题】如图所示,在演示声音是由物体振动引起的实验中,将正在发声的音叉紧靠悬线下的轻质小球,小球被多次弹开。在此实验中小球的作用是把音叉的微小振动放大,便于观察。这个实验用到的研究物理问题的方法是 。
【单选题】如图所示,在演示声音是由物体振动引起的实验中,将正在发声的音叉紧靠悬线下的轻质小球,小球被多次弹开。在此实验中小球的作用是 [ ]
【单选题】如图所示,在演示声音是由物体振动引起的实验中,将正在发声的音叉接触水面,水花四溅.在此实验中水的作用是( )
【单选题】The passage suggests that we should now re-examine our thinking about work and ______.
A.
be prepared to admit that being employed is not the only kind of work
B.
create more factories in order to increase our productivity
C.
set up smaller private enterprises so that we in turn can employ others
D.
be prepared to fill in time by baking-up housework
【单选题】6个月的健康婴儿体重7.5kg,为适应正常的生长发育需要,每日需供给热量
【单选题】6个月的健康婴儿体重7kg,为适应正常的生长发育需要,每日要供给热量
【判断题】Levinson suggests replacing all the maxims, except for the maxim of quality, with two principles: The Quantity Principle and The Relation Principle.