皮皮学，免费搜题
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【单选题】
接待( )消费者要避免过多的提示和热情,否则容易引起他们的反感;要允许他们有认真思考和挑选商品的时间,接待要有耐心。A.
胆汁质
B.
多血质
C.
粘液质
D.
抑郁质
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皮皮学刷刷变学霸
举一反三
【单选题】将函数y=sin2x的图象向左平移 个单位，再向上平移1个单位，所得图象的函数解析式是 [ ]
A.
y=cos2x
B.
y=2sin 2 x
C.
y=2cos 2 x
D.
y=
【单选题】The leaves of the plant Camellia sinensis______.
A.
can be used to make green tea or black tea after proper treatments
B.
are turned into oolong or black tea leaves for the purpose of curing
C.
have powerful evidence to show its healing power for certain illnesses
D.
taste good yet do little more than warm up the drinker
【判断题】The hormone erythropoietin, which is produced by the bone marrow in response to low oxygen supply.
A.
正确
B.
错误
【简答题】给出下列四个命题： ①“k=1”是“函数y=cos 2 kx-sin 2 kx的最小正周期为π”的充要条件； ②函数y=sin（2x- π 6 ）的图象沿x轴向右平移 π 6 个单位所得的函数表达式是y=cos2x； ③函数y=lg（ax 2 -2ax+1）的定义域是R，则实数a的取值范围是（0，1）； ④设O是△ABC内部一点，且 OA + OC =-2 OB ，则△AOB与△AOC的面积之比为...
【简答题】Lactic acid is produced in your muscles during rapid exercise when the body cannot supply enough oxygen to the tissues.A. True B. False
【简答题】make black white
【单选题】What __________ will it make whether Mr.Black tells us the story early or not? [ ]
A.
sense
B.
difference
C.
mistake
D.
use
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