题目内容
（请给出正确答案）
A.主动权在中央银行
B.富有弹性
C.时滞较短
D.干扰因素较少
答案
AB
解析：公开市场操作业务从政策实施到影响最终目标时滞较长而且干扰因素较多往往带来政策效果的不确定性同时也具有主动权在中央银行富有弹性可连续操作等优点
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更多“材料题根据下面材料，回答题。近年来，某国在经济快速发展的同时…”相关的问题
根据下面内容，回答题
A．0．25%～0．5%
B．O．5%～l%
C．1%～2%
D．2%
E．2%～4%
普鲁卡因用作浸润麻醉时的常用浓度
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根据下面选项，回答题：
A．溶剂
B．pH调节剂
C．渗透压调节剂
D．抗氧剂
E．抑菌剂
在盐酸普鲁卡因注射液处方中，下列物质的作用是
注射用水
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根据下面内容，回答题：
Scientists in the UK have announced that the piranhafish"s reputation 21 a fearsome 22 may well not be deserved. The fish， which is found in the Amazon in Brazil， have been 23 as deadly carnivores（食肉动物 ） that work in shoals to overwhelm their prey and strip it of its flesh in seconds.
However， experts 24 St Andrews University say that piranhas are omnivores（杂食动物） that mainly eat fish， plants and insects. They form. big groups not to hunt but to defend 25 against other predators， according to the team.
"Previously it was thought piranhas shoaled as it 26 them to form. a cooperative hunting group，" said Professor Anne Magurran. " 27， we have found that it is primarily a defensive behavior. "
Piranhas can be attacked by animals 28 dolphins， caimans and large fish， so forming a shoal is a good way of 29 being killed. Piranhas of 30 age stay in the middle of the group for 31 and the 32 of the shoal differs according to the level of 33 When the water level is 34， the fish form. small groups as there is space to escape， but when the water level drops， they form. large groups as protection 35 predators.
材料题请点击右侧查看材料问题 查看材料
A.as
B.as if
C.as though
D.since
根据下面内容，回答题
A．成纤维细胞
B．成牙本质细胞
C．组织细胞
D．未分化间充质细胞
E．淋巴细胞
位于牙髓周围，呈柱状紧接前 期牙本质排列成一层的细胞
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根据下面内容，回答题
A．包扎止血
B．填塞止血
C．结扎止血
D．指压止血
E．以上均正确
上颌骨骨折，鼻出血可采用
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表示双室模型静脉注射给药血药浓度一时间关系式的方程式是
