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【单选题】
北京最早见于文献的名称是( )。A.
幽州
B.
燕京
C.
蓟
D.
燕
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举一反三
【单选题】According to the passage, the work of scientists is similar to that of equations in infinitesimal calculus because scientists
A.
work to explain concepts that are abstract in nature, not unlike infinity
B.
recognize that meaning is not the only benefit of scientific endeavor
C.
are unable to explain their work in any more concrete terms than mathematicians express theirs
D.
can discover a series of more and more precise truths, but can never achieve absolute accuracy
E.
are intrinsically more interested in formulas and theories than the predictions that can be made by them
【简答题】昆虫的蛹期有何特点？对指导防治有何意义？
【简答题】婴儿7个月，发热2天，体温39～40稍咳，一般情况佳，除流涕及咽部微充血外，未见其他异常，家长给予口服速效感冒灵。若作下列考虑，哪项是正确的A、如继续发热4～5天后出皮疹，考虑为麻疹 B、再发热2天左右，热退全身出现红色斑丘疹，则为幼儿急疹 C、若全身出现弥漫性皮疹，应考虑为猩红热，因本病多见于6～18个月小儿 D、这是皮肤黏膜淋巴结综合征的前驱表现 E、若皮肤出现荨麻疹样皮疹，则为药物疹 本病的...
【简答题】昆虫蛹期有什么特点?
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