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【简答题】
(2018· 四川成都期中 ) 下列有胡萝卜中提取胡萝卜素的描述中,错误的是 ( ) A .一般情况下,提取胡萝卜素时,提取效率与原料颗粒含水量成反比 B .浓缩的过程会使 β 胡萝卜素挥发,进而实现萃取剂与 β 胡萝卜素的分开 C .在胡萝卜颗粒加热干燥过程中,应严格将温度和时间控制在一定范围内,因为温度过时间过长会导致胡萝卜素分解 D .胡萝卜素粗品可通过纸层析法进行鉴定,且需用胡萝卜素标准样品作对照
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举一反三
【单选题】What are Alan and Michelle mainly doing?
A.
They are planning a picnic for the department.
B.
They are wondering what the weather will be like at the annual picnic.
C.
They are discussing how to escape from the sun.
D.
They are having cold drinks and talking about the weather.
【单选题】关于链状带绦虫和肥胖带绦虫的描述，不正确的是（）。
A.
两种绦虫的虫卵相似
B.
成虫均可寄生于人的小肠
C.
囊尾蚴均可寄生于人体（肥胖带绦虫不可）
D.
成虫的头节均有吸盘
E.
均属圆叶目绦虫
【简答题】肥胖带绦虫成虫寄生于人体 [填空(1)] ，人因食入 [填空(2)] 而患牛带绦虫病。A. B.
【单选题】What are Allen and Michelle mainly doing?
A.
They are planning a picnic for the department.
B.
They are wondering what the weather will be like at the annual picnic.
C.
They are discussing how to escape from the sun.
D.
They are having cold drinks and talking about the weather.
【单选题】What do many African-Americans write about in their blogs?
A.
Whether Michelle can live up to the high expectations of her fans.
B.
How Michelle should behave as a public figure.
C.
How proud they are to have a black woman in the White House.
D.
What Michelle should do as wife and mother in the White House.
【单选题】为了能在两地控制同一台电动机 , 两地的启动按钮 SBl 、 SB2 应采用 ( ) 的接法
A.
SBl 、 SB2 的常开触点并联接在一起
B.
S81 、 S82 的常开触点串联接在一起
C.
S131 、 S132 的常闭触点并联接在一起
D.
S81 、 SB2 的常闭触点串联接在一起
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