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【单选题】
中药材黄连的 药用部位是( ) A.直根 B.根状茎 C.子根 D. E.根及根茎A.
B.
C.
D.
E.
E
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【简答题】Religiously, most Americans are _______; among them 52% are ______ and 24% ______.
【单选题】Samuel JohnsonSamuel Johnson (18 September 1709– 13 December 1784), often referred to as Dr Johnson, was an English writer who made lasting contributions to English literatureas a poet, playwright, es...
A.
A Dictionary of the English Language
B.
A Journey to the Western Islands of Scotland
C.
Lives of the Most Eminent English Poets
D.
The Gentleman's Magazine
【简答题】在△ABC中，已知角A、B、C所对的边分别是a、b、c，边c=，且tanA+tanB=tanA·tanB－，又△ABC的面积为S △ ABC =，求a+b的值。（本题满分12分）
【单选题】Samuel JohnsonSamuel Johnson (18 September 1709– 13 December 1784), often referred to as Dr Johnson, was an English writer who made lasting contributions to English literatureas a poet, playwright, es...
A.
The Life of Samuel Johnson
B.
Life of Mr Richard Savage
C.
London and The Vanity of Human Wishes
D.
Irene
【简答题】作功冲程:当压缩冲程活塞接近上止点时,火花塞产生电火花点燃混合气,并迅速燃烧,此时进、排气门仍然___________(开启或关闭),气缸内气体的温度、压力急剧___________,从而推动已经越过上止点的活塞向___________止点移动,通过连杆使曲轴旋转并输出机械能。
【简答题】在△ABC中，已知内角A，B，C的对边分别为a，b，c，且满足 2 asin（B+ π 4 ）=c （I）求角A的大小．， （II）若△ABC为锐角三角形，求sinBsinC的取值范围．
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