皮皮学,免费搜题
登录
搜题
【多选题】
如图所示 ,有关3描述正确的是?
A.
是胚囊营养物质贮藏的主要场所;
B.
从珠心或珠被组织吸取营养供胚囊发育。
C.
合成和分泌某些趋化物质和酶类,引导花粉管的定向生长,使之进入胚囊;
D.
是花粉管进入和释放内容物的场所,有助于精子散向卵细胞和中央细胞
E.
最重要的是极核与精子融合受精后,形成三倍体的胚乳。
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
.
..
皮皮学刷刷变学霸
举一反三
【单选题】在flash 绘图工具中,可以同时产生笔触和填充的工具是( )。
A.
铅笔工具、线条工具和椭圆工具
B.
矩形工具、椭圆工具和多角星工具
C.
刷子工具、铅笔工具和多角星工具
D.
线条工具、椭圆工具和矩形工具
【单选题】It follows _______if the Labour Government is to secure acceptance of its economic package, it has to secure the support of MPs from either the Liberal or the Conservative party.
A.
which
B.
whether
C.
what
D.
that
【单选题】Suppose that 500 candy bars are demanded at a particular price. If the price of candy bars rises from that price by 10 percent, the number of candy bars demanded falls to 480. Using the midpoint appro...
A.
price elasticity of demand for candy bars in this price range is about 0.24
B.
price elasticity of demand for candy bars in this price range is about 0.41
C.
demand for candy bars in this price range is unit elastic
D.
price increase will decrease the total revenue of candy bar sellers
【单选题】在Flash的绘图工具中,可以同时产生笔触和填充的工具是()。
A.
铅笔工具、线条工具和椭圆工具
B.
矩形工具、椭圆工具和多角星形工具
C.
刷子工具、铅笔工具和多角星形工具
D.
线条工具、椭圆工具和矩形工具
【单选题】在 Flash 的绘图工具中,可以同时产生笔触和填充的工具有
A.
铅笔工具、线条工具和椭圆工具
B.
矩形工具、椭圆工具和多角星形工具
C.
刷子工具、铅笔工具和多角星形工具
D.
线条工具、椭圆工具和矩形工具
【单选题】Suppose that 50 ice cream cones are demanded at a particular price. If the price of ice cream cones rises from that price by 4 percent, the number of ice cream cones demanded falls to 46. Using the mi...
A.
demand for ice cream cones in this price range is elastic.
B.
demand for ice cream cones in this price range is inelastic.
C.
demand for ice cream cones in this price range is unit elastic.
D.
price elasticity of demand for ice cream cones in this price range is 0.
【单选题】心迷走神经节后纤维始于
A.
迷走背核
B.
疑核和孤束核
C.
心内神经节
D.
星状神经节
【单选题】When the value of the euro changes from $1.30 to $1.20, it follows that:
A.
European Union imports from the United States increase.
B.
U.S. exports to the European Union increase.
C.
U.S. imports from the European Union increase.
D.
European Union exports to the United States decrease.
【单选题】心迷走神经节后纤维起始于( )
A.
迷走背核
B.
疑核
C.
孤束核
D.
星状神经节
E.
心内神经节
【单选题】10~11共用题干 男,33岁。间歇性上腹痛3年,伴嗳气、反酸。近3天来上腹痛加剧,一天来解柏油样便4次,今晨晕倒,急送入院。查体,脉搏128次/分,血压78/50mmHg,该患者应采取的体位是
A.
平卧位,下肢抬高
B.
平卧位,头部抬高
C.
左侧卧位
D.
右侧卧位
E.
半坐位
相关题目: